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Optical Brightener OB-1

Product Name: Optical Brightener OB-1 / Fluorescent Brightener 393
Chemical Name: 2,2′-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole
Color Index: C.I. 393
CAS: 1533-45-5
Molecular Formula: C₂₈H₁₈N₂O₂
Formula Weight: 414.45 g/mol
Synonyms: Fluorescent Brightener 393; OB-1; 2,2′-(4,4′-Diphenylvinyl)dibenzoxazole; Fluorescent Whitening Agent OB-1; Optical Brightening Agent OB-1; Bisbenzoxazole Derivative; FBA 393
Application:
Polyester Fibers, Nylon Fibers, Polypropylene Fibers, Engineering Plastics (ABS, PS, HIPS, PC, PA, PET, PBT), PVC, PP, PE, EVA, Masterbatch, Clear Lacquers, Paints, Printing Inks, Coatings, Plastic Recycling, Synthetic Leather, Photoelectric Communication Materials

Optical Brightener OB

Product Name: Optical Brightener OB / Fluorescent Brightener 184

Chemical Name: 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene

Color Index: C.I. 184

CAS: 7128-64-5

Molecular Formula: C₂₆H₂₆N₂O₂S

Formula Weight: 430.56 g/mol

Synonyms: Fluorescent Brightener 184; FBA 184; Optical Brightening Agent OB; OB Brightener; 2,2′-(2,5-Thiophenediyl)bis[5-tert-butylbenzoxazole]; Fluorescent Whitening Agent OB; UVITEX OB

Application:

Plastics (PVC, PE, PP, PS, ABS, PMMA, POM, HIPS), Engineering Plastics, Synthetic Fibers (Polyester, Nylon, Polypropylene), Paints & Coatings, Printing Inks, Lacquers, Photography Paper, Anti-Counterfeiting Applications

Optical Brightener FP-127

Product Name: Optical Brightener FP-127 / Fluorescent Brightener 378

Chemical Name: 4,4′-Bis[2-(2-methoxyphenyl)ethenyl]-1,1′-biphenyl

Color Index: C.I. 378

CAS: 40470-68-6

Molecular Formula: C₃₀H₂₆O₂

Formula Weight: 418.53 g/mol

Synonyms: Fluorescent Brightener 378; Fluorescent Whitening Agent FP;

4,4′-Bis(2-methoxystyryl)biphenyl; C.I. 378; Uvitex FP; CSFC 127;

4,4′-Bis[(E)-2-(2-methoxyphenyl)ethenyl]-1,1′-biphenyl

 Application:

Plastics (PVC, PE, PP, PS, ABS), EVA, TPU, PU, TPR, Synthetic Leather, Paints & Coatings, Printing Inks, Man-Made Fibers, Rubber, Adhesives, Polymer Masterbatch

Optical Brightener CBS-X

Product Name: Optical Brightener CBS-X / Fluorescent Brightener 351

Chemical Name: Disodium 4,4′-bis(2-sulfostyryl)biphenyl

Color Index: C.I. 351

CAS: 27344-41-8

Molecular Formula: C₂₈H₂₀Na₂O₆S₂

Formula Weight: 562.56 g/mol

Synonyms: Fluorescent Brightener 351; Tinopal CBS-X; 4,4′-Bis(2-sulfostyryl)biphenyl disodium salt; Disodium 4,4′-bis(2-sulfonatostyryl)biphenyl; FBA 351; Optical Brightening Agent CBS-X; Calcofluor CG; Stilbene 3

Application:

Laundry Detergents (Powders, Liquids, Concentrates), Soaps & Soap Bars, Fabric Softeners, Textile Processing (Cotton, Linen, Polyamide, Wool, Silk), Paper Manufacturing, Bleaching & Dyeing Auxiliaries

Optical Brightener CXT

Product Name: Optical Brightener CXT / Fluorescent Brightener 71

Chemical Name:

Disodium 4,4′-bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2′-disulfonate

Color Index: C.I. 71

CAS: 16090-02-1

Molecular Formula: C₄₀H₃₈N₁₂Na₂O₈S₂

Formula Weight: 924.93 g/mol

Synonyms: Fluorescent Brightener 71; FBA 71; Optical Brightening Agent CXT; C.I. 71; Tinopal CXT; Whitening Agent CXT; Stilbene-based Fluorescent Brightener

 Application:

Laundry Detergents (Powders, Concentrates), Soaps & Soap Bars, Textile Processing (Cotton, Nylon, Polyamide, Vinylon, Wool), Paper Manufacturing, Bleaching & Dyeing Auxiliaries

Optical Brightener BBU

Product Name: Optical Brightener BBU / Fluorescent Brightener 220

Chemical Name:

Tetrasodium 4,4′-bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2′-disulfonate

Color Index: C.I. 220

CAS: 16470-24-9

Molecular Formula: C₄₀H₄₀N₁₂Na₄O₁₆S₄

Formula Weight: 1165.04 g/mol

Synonyms: Fluorescent Brightener 220; FBA 220; Optical Brightening Agent BBU; Blankophor BBU; Leucophor U; C.I. 220; Phorwhite BBU

Application:

Textiles (Cotton, Viscose, Linen, Polyamide), Paper Manufacturing (Pulp, Coating, Surface Sizing), Detergents, Printing (Discharge Printing Paste)

Solvent Violet 13

Product Name: Solvent Violet 13 / C.I. 60725

Chemical Name: 1-Hydroxy-4-(p-toluidino)anthraquinone

/ 1-Hydroxy-4-[(4-methylphenyl)amino]anthracene-9,10-dione

Color Index: C.I. 60725

CAS: 81-48-1

Molecular Formula: C₂₁H₁₅NO₃

Formula Weight: 329.35 g/mol

Synonyms: Solvent Violet 13; C.I. 60725; D&C Violet No. 2; Alizurol Purple; Quinizarin Blue; Oil Violet IRS; Macrolex Violet B; Disperse Blue 72; Solvent Blue 90; Plast Violet 4001; 1-Hydroxy-4-(p-toluidino)anthraquinone; Violet B

Application:

Engineering Plastics (PS, ABS, PC, PMMA, PET, PVC), Polyester Fibers (Dope Dyeing), Cosmetics (Nail Polish, Hair Dyes, Lipsticks), Paints & Coatings, Printing Inks, Solvents & Fuels, Pyrotechnics (Violet Smoke)

Solvent Red 24

Product Name: Solvent Red 24 / Sudan IV / Oil Red RR

Chemical Name: 1-[[2-Methyl-4-[(2-methylphenyl)azo]phenyl]azo]-2-naphthalenol

Color Index: C.I. 26105

CAS: 85-83-6

Molecular Formula: C₂₄H₂₀N₄O

Formula Weight: 380.44 – 380.45 g/mol

Synonyms: Sudan IV; Oil Red IV; Biebrich Scarlet R; Candle Scarlet G; Oil Red S; Oil Red RR; 1-(4-o-Tolylazo-o-tolylazo)-2-naphthol; C.I. 26105

Application:

Plastics (PS, PVC, PMMA), Oils & Fats, Waxes, Candles, Rubber Toys, Printing Inks, Wood Stains, Shoe & Floor Polishes, Petroleum Products, Hydrocarbon Solvents, Biological Staining (Lipids & Fats)

Solvent Yellow 93

Product Name: Solvent Yellow 93 / Transparent Yellow 3G

Chemical Name: 4,4′-(E)-methylylidenebis(5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one) / (4E)-5-methyl-4-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)methylidene]-2-phenylpyrazol-3-one

Color Index: C.I. 48160

CAS: 4702-90-3

Molecular Formula: C21H18N4O2

Formula Weight: 358.39 g/mol

Synonyms: Transparent Yellow 3G; Macrolex Yellow 3G; Sandoplast Yellow 3G; Solvaperm Yellow 3G; Keyplast Yellow 3G; Oplas Yellow 140; Plast Yellow 1002; Thermoplast Yellow 104; Kayaset Yellow GN; Yellow 3G; C.I. 48160

Application:

Engineering Plastics (PS, ABS, SAN, PMMA, PC, PET), Polyester Fibers, PVC (Rigid), Paints & Coatings, Printing Inks, Toners, Petroleum Products, Oils & Waxes

Phthalocyanine blue 15-1

Product Name: Phthalocyanine Blue 15:1 (P.B. 15:1)

Chemical Name:  [29H, 31H-phthalocyaninato(2-)-N29, N30, N31, NN32]-,(SP-4-1-)-Copper

Color Index: C.I. 74160

CAS: 12239-87-1/147-14-8 (High-Purity Industrial Grade) – Innovatively optimized with beta-crystal modification technology, featuring a unique deep blue hue with subtle green undertones, exceptional opacity, and superior heat resistance, tailored for high-end solvent-based, plastic, and coating applications.

Molecular formula: C32H16CuN8

Formula Weight: 576.07 g/mol – Unique beta-crystal copper phthalocyanine structure enhances color depth, opacity, and thermal stability, outperforming alpha-crystal variants (e.g., P.B. 15:3) in high-temperature and opaque formulation scenarios.

Synonyms: Phthalocyanine Blue 15:1; P.B. 15:1; Copper Phthalocyanine Blue 15:1; Beta-Crystal Phthalocyanine Blue; Opaque Blue Pigment; High-Heat-Resistant Blue Pigment; Solvent-Stable Phthalocyanine Blue

Application:

High-end solvent-based printing inks, automotive coatings, engineering plastics, industrial paints, plastic packaging, and decorative colorants, compatible with solvent-based, plastic melt, and high-temperature formulation systems.

Pigment red 53-1

Product Name: Pigment Red 53:1 (P.R. 53:1)

Chemical Name: Barium bis[2-chloro-5-[(2-hydroxy-1-naphthyl)azo]toluene-4-sulphonate]

Color Index: C.I. 15585:1

CAS:  (High-Purity Industrial Grade) – Optimized with advanced diazotization, coupling and precision calcium salinization technology, featuring a unique bright yellowish red (vivid scarlet) hue, excellent solvent resistance, and good heat stability, tailored for printing inks, plastic coloring, industrial paints, and stationery, compliant with global industrial pigment safety standards.

Molecular formula: C34H24BaCl2N4O8S2

Formula Weight: 888.939 g/mol – Unique azo-based calcium salt lake structure differentiates it from Pigment Red 48 series (strontium/barium salt); it has a more intense yellowish red hue than 48:1/48:2/48:3, superior solvent resistance, and better compatibility with water-based formulations, making it a preferred choice for high-gloss printing inks and water-based coatings.

Synonyms: Pigment Red 53:1; P.R. 53:1; Lithol Red D; Calcium Lake Scarlet Pigment; Bright Yellowish Red Pigment; High-Solvent-Resistant Red Pigment; Water-Based Compatible Red Pigment

Application:

High-end solvent-based/water-based printing inks (packaging, labels, magazines), plastic coloring (PVC, PE, PP), industrial paints (water-based wood paints, metal protective paints), stationery (color pencils, crayons), and textile printing, applicable to high-gloss and water-based formulation requirements.

Pigment red 254

Product Name: Pigment Red 254 (P.R. 254)

Chemical Name: 3,6-BIS(4-CHLOROPHENYL)-2,5-DIHYDRO-PYRROLO[3,4-C]PYRROLE-1,4-DIONE

Color Index: C.I. 56110

CAS: 84632-65-5 (High-Purity Industrial Grade) – Innovatively upgraded with advanced quinacridone modification technology, ensuring superior color vividness, lightfastness, and dispersion performance for high-end applications.

Molecular formula: C18H10Cl2N2O2

Formula Weight: 357.19 g/mol – Unique quinacridone core structure enhances color saturation and thermal stability, outperforming conventional red organic pigments.

Synonyms: Pigment Red 254; P.R. 254; Quinacridone Red 254; C.I. Pigment Red 56110; Permanent Red 254; High-Vivid Red Pigment; High-Lightfastness Organic Pigment; Eco-Friendly Red Pigment

Application: 

High-end printing inks, automotive coatings, engineering plastics, food-contact packaging, textile printing, and decorative colorants, compatible with solvent-based, aqueous, and plastic melt formulations.

Ultramarine blue

Product Name: Ultramarine Blue

Chemical Name:Ultramarine Blue

C.I.: 77007

CAS: 57455-37-5

EINECS: 309-928-3

Molucular Formula: Na6Al4Si6S4O20

Formula Weight: 994.500988

Synonyms: CAS 57455-37-5, CI 77007, pigment blue 29, blue ultramarine, Ultramarine, Oriental Blue, Permanent Blue, P.Blue 29

Application:

It is commonly used as a colorant and optical brightener for plastics, rubber, inks, color painting, textiles, paper, cosmetics, detergents, cement and construction.

PET Optical Brightener OB-1 masterbatch

Product Name: PET Optical Brightener OB-1 Masterbatch

C.I.: —

CAS: —

purity: 10%-30%

Appearance:yellow green plastic granule

Ingredient: optical brightener OB-1, PET

Synonyms: OB-1 Masterbatch, plastic masterbatch, Plastic granule, Brightener Masterbatch

Application:

It is used for the whitening of plastic products and recycled plastic products, such as recycled polyester staple fiber, recycled PVC and other plastics, and can also be used for ABS, PS, HIPS, PC, PP, PE, PE, EVA and hard PVC.

Titanium Dioxide Masterbatch

Product Name: Titanium Dioxide Masterbatch / TiO2 Masterbatch / matte masterbatch

C.I.: —

CAS: —

purity: 40%-60%(accept customized)

Appearance:White plastic particles

Ingredient: Titanium Dioxide TIO2, PET(or other plastics)

Synonyms: TiO2 Masterbatch, Titanium Dioxide Masterbatch,White Masterbatch ,matte masterbatch

Application:

It is used for the whitening and matting and colorant of plastics and recycled plastics, such as recycled polyester staple fiber, recycled PVC ,PET and other plastics, and can also be used for ABS, PS, HIPS, PC, PP, PE, PE, EVA ,PVC.

Rutile Titanium Dioxide

Product Name: Plastic Rutile Titanium Dioxide

C.I.: 257-372-4

CAS: 13463-67-7

purity:≥98%

Appearance:White powder

Molucular Formula:TIO2

Formula Weight: 79.8658

Synonyms:Rutile TIO2 / Plastic Rutile Titanium Dioxide / Rutile Titanium Dioxide

Application:

Titanium dioxide is used in almost all thermosetting and thermoplastic plastics, such as PO (mainly PE), PS, ABS, PVC, PET and so on.

Ultraviolet absorber 531

Product Name: ultraviolet absorber 531

C.I.: 40425

CAS: 1843-05-6

Ionic type:nonionic

Appearance: Slightly yellow powder

Ingredient: Benzotriazoles

Molucular Formula:  C21H26O3

Formula Weight: 326.43

Synonyms: UV-531, 2-hydroxy-4-octoxy-benzophenone, UV absorber 531, ultraviolet absorber 531, BENZOPHENONE-12, CAS 1843-05-6

Application:

It is mainly used as UV absorber for paints, coatings, polyurethane, rubber, plastics and so on,especially recommended in PE, PP, PVC etc..

zeolite 4A

Product Name:Zeolite 4A

C.I.: 215-479-3

CAS: 1318-02-1/1327-44-2

Ionic type—-

Appearance: White or light green powder

Ingredient: aluminosilicate

Molucular Formula:Na12Al12Si12O48·27H2O or Na12[(AlO2)12(SiO2)12]·27H2O

Formula Weight: 218.25

Synonyms: Zeolite 4A, zeolite 4a powder, Molecular sieves 4A, Molecular 4A

Application:

Used in cleaning products, laundry detergents, washing agents and water treatment additives, fertilizers, etc..

CARBOXYMETHYL CELLULOSE

Product Name: CARBOXYMETHYL CELLULOSE

C.I.: 618-378-6

CAS: 9004-32-4

Ionic type:anionic

Appearance: White or light yellow fibrous powder

Ingredient: Carboxymethylated derivatives

Molucular Formula: C6H7O2(OH)2CH2COONa

Formula Weight: 265.204

Synonyms: CMC, Carboxy Methylcellulose Sodium, CARBOXYMETHYL cellulose sodium

Application:

As a non-toxic and odorless thickener, it has a wide range of applications and is involved in washing, food, paper, textile, medicine and cosmetics, etc..

2018
Date of Establishment
21
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4
R&D Center
36 +
Trading Nations
Recommended Products

Full-process quality testing, with professional laboratories ensuring the stability and consistency of each batch of products.

Optical Brightener OB-1

Product Name: Optical Brightener OB-1 / Fluorescent Brightener 393
Chemical Name: 2,2′-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole
Color Index: C.I. 393
CAS: 1533-45-5
Molecular Formula: C₂₈H₁₈N₂O₂
Formula Weight: 414.45 g/mol
Synonyms: Fluorescent Brightener 393; OB-1; 2,2′-(4,4′-Diphenylvinyl)dibenzoxazole; Fluorescent Whitening Agent OB-1; Optical Brightening Agent OB-1; Bisbenzoxazole Derivative; FBA 393
Application:
Polyester Fibers, Nylon Fibers, Polypropylene Fibers, Engineering Plastics (ABS, PS, HIPS, PC, PA, PET, PBT), PVC, PP, PE, EVA, Masterbatch, Clear Lacquers, Paints, Printing Inks, Coatings, Plastic Recycling, Synthetic Leather, Photoelectric Communication Materials

Optical Brightener CBS-X

Product Name: Optical Brightener CBS-X / Fluorescent Brightener 351

Chemical Name: Disodium 4,4′-bis(2-sulfostyryl)biphenyl

Color Index: C.I. 351

CAS: 27344-41-8

Molecular Formula: C₂₈H₂₀Na₂O₆S₂

Formula Weight: 562.56 g/mol

Synonyms: Fluorescent Brightener 351; Tinopal CBS-X; 4,4′-Bis(2-sulfostyryl)biphenyl disodium salt; Disodium 4,4′-bis(2-sulfonatostyryl)biphenyl; FBA 351; Optical Brightening Agent CBS-X; Calcofluor CG; Stilbene 3

Application:

Laundry Detergents (Powders, Liquids, Concentrates), Soaps & Soap Bars, Fabric Softeners, Textile Processing (Cotton, Linen, Polyamide, Wool, Silk), Paper Manufacturing, Bleaching & Dyeing Auxiliaries

Solvent Violet 13

Product Name: Solvent Violet 13 / C.I. 60725

Chemical Name: 1-Hydroxy-4-(p-toluidino)anthraquinone

/ 1-Hydroxy-4-[(4-methylphenyl)amino]anthracene-9,10-dione

Color Index: C.I. 60725

CAS: 81-48-1

Molecular Formula: C₂₁H₁₅NO₃

Formula Weight: 329.35 g/mol

Synonyms: Solvent Violet 13; C.I. 60725; D&C Violet No. 2; Alizurol Purple; Quinizarin Blue; Oil Violet IRS; Macrolex Violet B; Disperse Blue 72; Solvent Blue 90; Plast Violet 4001; 1-Hydroxy-4-(p-toluidino)anthraquinone; Violet B

Application:

Engineering Plastics (PS, ABS, PC, PMMA, PET, PVC), Polyester Fibers (Dope Dyeing), Cosmetics (Nail Polish, Hair Dyes, Lipsticks), Paints & Coatings, Printing Inks, Solvents & Fuels, Pyrotechnics (Violet Smoke)

Ultramarine blue

Product Name: Ultramarine Blue

Chemical Name:Ultramarine Blue

C.I.: 77007

CAS: 57455-37-5

EINECS: 309-928-3

Molucular Formula: Na6Al4Si6S4O20

Formula Weight: 994.500988

Synonyms: CAS 57455-37-5, CI 77007, pigment blue 29, blue ultramarine, Ultramarine, Oriental Blue, Permanent Blue, P.Blue 29

Application:

It is commonly used as a colorant and optical brightener for plastics, rubber, inks, color painting, textiles, paper, cosmetics, detergents, cement and construction.

Titanium Dioxide Masterbatch

Product Name: Titanium Dioxide Masterbatch / TiO2 Masterbatch / matte masterbatch

C.I.: —

CAS: —

purity: 40%-60%(accept customized)

Appearance:White plastic particles

Ingredient: Titanium Dioxide TIO2, PET(or other plastics)

Synonyms: TiO2 Masterbatch, Titanium Dioxide Masterbatch,White Masterbatch ,matte masterbatch

Application:

It is used for the whitening and matting and colorant of plastics and recycled plastics, such as recycled polyester staple fiber, recycled PVC ,PET and other plastics, and can also be used for ABS, PS, HIPS, PC, PP, PE, PE, EVA ,PVC.

PET Optical Brightener OB-1 masterbatch

Product Name: PET Optical Brightener OB-1 Masterbatch

C.I.: —

CAS: —

purity: 10%-30%

Appearance:yellow green plastic granule

Ingredient: optical brightener OB-1, PET

Synonyms: OB-1 Masterbatch, plastic masterbatch, Plastic granule, Brightener Masterbatch

Application:

It is used for the whitening of plastic products and recycled plastic products, such as recycled polyester staple fiber, recycled PVC and other plastics, and can also be used for ABS, PS, HIPS, PC, PP, PE, PE, EVA and hard PVC.

 Shandong Keyang Chemical, Ltd. | Professional Fine Chemical Products & Solutions
We specialize in the research, development, production, and global supply of optical brightener, masterbatches, pigments, dyes, titanium dioxide, detergent additives, and plastic additives. Based in China and serving the world, we provide stable and reliable chemical products and customized technical support to customers in the plastics, detergents, textile, coatings and paint ink industries.
News

Our Latest News

31

03/2026

Is Your Plastic Product Still Yellowish Even After Adding Optical Brighteners Here is Why.

You’ve added Optical Brightening Agents (OBAs) to your plastic formulation, expecting that brilliant, "snow-white" finish. Yet, the result is a dull, yellow-white or gray-white product that misses the market standard. This is a common frustration in the plastics industry. If your product isn’t whitening, it’s rarely the OBA "failing"—it’s usually a mismatch in chemistry. Having trouble-shooted numerous production lines, I’ve found that the issue almost always falls into one of these three critical categories: 1️⃣ You Are Using the Wrong Type of OBA (The Compatibility Trap) Not all fluorescent whitening agents are created equal. Using an OBA designed for PVC in a Polypropylene (PP) or Polyethylene (PE) system is like putting diesel in a petrol car. The Science: Different polymers have different polarities and processing temperatures. The Fix: Ensure you are using a high-temperature resistant OBA (like OB-1 or FP-127) for engineering plastics (ABS, PS, PC) and the correct dispersion type for polyolefins. The base resin dictates the OBA chemistry. 2️⃣ "More is Better" is a Dangerous Myth (The Concentration Quenching) It is instinct to think that adding double the amount of brightener will yield double the brightness. In reality, it often does the opposite. The Science: Fluorescent whitening agents work by absorbing UV light and re-emitting it as blue light. If you overload the system, the excess OBA particles actually absorb this blue light, creating a greenish or yellow cast. The Fix: Stick to the optimal dosage range (usually 0.01% – 0.05% for most plastics). Beyond a certain saturation point, whiteness decreases. 3️⃣ Your "Base" is Too Dark (The Garbage In, Garbage Out Rule) An optical brightener is a whitening agent, not a covering agent. Think of it as a highlighter pen—it makes white paper brighter, but it cannot turn black paper white. The Science: OBAs add a fluorescent glow to mask yellowness. However, if your recycled resin or raw material has a naturally dark or yellow tint due to impurities or degradation, the OBA simply doesn't have a clean "white canvas" to work from. The Fix: Evaluate your base resin quality. If the raw material is too yellow, you may need to combine the OBA with a toning pigment (like ultramarine blue) first, or switch to a cleaner resin source. 💡 Quick Tip: Always test the compatibility of your OBA with other additives like UV stabilizers or antimony trioxide, as they can sometimes "block" the fluorescence effect. Have you ever faced this "whitening wall" in your production? Have you found out the main reason?Contact us to discuss together and find out the real reason. #plastic #opticalbrightener #plasticadditive #oba #pvc #pe #pp #ABS #OpticalBrighteningAgent #ob1 #fp127

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