What is Color Fastness? - The Secret of Non-Fading Fabric

If your carefully made creation faded after just a few washes, it's because of low color fastness. Color fastness is an indicator of how well fabric color is maintained. Today let's explore what color fastness is, how to check it, and how to maintain it.

What is Color Fastness?

Basic Concept

Color Fastness is a measure of how resistant dyed fabric's color is to external factors (washing, sunlight, friction, etc.).

Meaning of 'Gyeonroe' (堅牢):

• Gyeon (堅): Firm
• Roe (牢): Solid
• "Strong and secure"

Importance:

• Color lasts long
• Doesn't bleed onto other clothes
• Quality indicator
• Long-term use possible

Measurement Method

Grade System:

• Grade 1: Very poor (severe color change)
• Grade 2: Poor
• Grade 3: Fair
• Grade 4: Good
• Grade 5: Excellent (almost no color change)

Half Grades:

• Grade 3-4: Between grades 3 and 4
• Grade 4-5: Nearly grade 5 level

Types of Color Fastness

1. Wash Fastness

Definition:

• Degree of color retention when washing
• Most important indicator

Test Method:

• 30-minute wash in 40°C water
• Washed with white cloth
• Check color change and bleeding

Characteristics by Grade:

• Grade 5: Almost no color change even after 30+ washes
• Grade 4: Can wash about 20 times
• Grade 3: Color fades after about 10 washes
• Grade 2: Color fades within 5 washes
• Grade 1: Color bleeds from first wash

Recommended Grades:

• Clothing: Grade 4 or higher
• Bedding: Grade 4-5
• Decorative items: Grade 3 or higher

2. Light Fastness

Definition:

• Degree of color retention when exposed to sunlight
• Important for curtains and outdoor items

Test Method:

• Artificial sunlight exposure
• Measure color change after set time
• Grades 1-8 (1 is poor, 8 is excellent)

Characteristics by Grade:

• Grades 7-8: Color maintained for years
• Grades 5-6: Color maintained for 1-2 years
• Grades 3-4: Color fades within months
• Grades 1-2: Color fades within weeks

Recommended Grades:

• Curtains: Grade 5 or higher
• Outdoor furniture: Grade 6 or higher
• Indoor clothing: Grade 4 or higher

3. Rubbing Fastness (Crocking)

Definition:

• Degree of color bleeding when rubbed
• Differentiate dry/wet rubbing

Test Method:

• Rub fabric with white cloth
• Test both dry and wet states
• Check degree of white cloth staining

Dry Rubbing:

• Grade 5: No transfer at all
• Grade 4: Slight transfer
• Grade 3: Noticeable transfer
• Grades 1-2: Severe transfer

Wet Rubbing:

• Lower grade than dry
• Easier bleeding when wet

Recommended Grades:

• Jeans: Grade 3 or higher (especially dark colors)
• General clothing: Grade 4 or higher
• Contact with white clothing: Grade 4-5

4. Perspiration Fastness

Definition:

• Color change and bleeding from sweat
• Important for summer clothing

Test Method:

• Soak in artificial sweat solution
• Test acidic/alkaline sweat separately
• Apply temperature and pressure

Grades:

• Grade 4-5: Resistant to sweat
• Grade 3: Possible bleeding when sweating
• Grades 1-2: Very weak to sweat

Recommended Grades:

• Summer clothing: Grade 4 or higher
• Sportswear: Grade 4-5
• Underwear: Grade 4-5

5. Water Fastness

Definition:

• Color bleeding when touched by water
• Important for swimwear, umbrellas, etc.

Test:

• Soak in water with pressure applied
• In contact with white cloth
• Check bleeding degree

Recommended Grades:

• Swimwear: Grade 4-5
• Umbrellas: Grade 4 or higher
• Raincoats: Grade 4 or higher

6. Dry Cleaning Fastness

Definition:

• Color retention during dry cleaning
• Important for high-end clothing

Recommended Grades:

• Suits: Grade 4-5
• Dresses: Grade 4 or higher

Color Fastness by Dyeing Method

Reactive Dye

Wash Fastness: Grade 4-5

• Chemical bond with fiber
• Very excellent fastness
• Optimal for natural fibers

Light Fastness: Grade 4-6

• Varies by color
• Darker colors stronger

Features:

• Best fastness
• High cost
• Requires professional process

Uses:

• High-quality clothing
• Bedding
• Long-use products

Pigment Printing

Wash Fastness: Grade 2-3

• Attaches to surface
• Easily peels off
• Color fades after 5-10 washes

Light Fastness: Grade 3-4

• Fair level

Features:

• Affordable
• Fast production
• Low fastness

Uses:

• Cheap t-shirts
• Single-use products
• Promotional goods

Sublimation Printing

Wash Fastness: Grade 4-5

• Penetrates polyester
• Excellent fastness

Light Fastness: Grade 4-5

• Very good

Features:

• Polyester only
• Excellent fastness
• Vivid colors

Uses:

• Sportswear
• Polyester products

Direct Dye

Wash Fastness: Grade 2-3

• Low fastness
• Affordable

Uses:

• Low-cost products
• Single-use items

Color Fastness by Color

Dark Colors (Black, Navy, Dark Green)

Features:

• Excellent light fastness
• May bleed slightly on first wash
• Caution about bleeding

Care:

• First wash separately
• Use cold water
• Wash inside out

Bright Colors (Red, Blue, Yellow)

Features:

• Light fastness may be lower
• Fades easily in sunlight
• Difficult to maintain vivid color

Care:

• Avoid direct sunlight
• Cold water washing
• Dry in shade

Pastel Colors

Features:

• Fair light fastness
• Good wash fastness
• Stains are noticeable

Care:

• Remove stains immediately
• Caution with bleach

White

Features:

• Fastness concept doesn't apply
• May yellow

Care:

• Oxygen bleach usable
• Can dry in sunlight

How to Check Color Fastness

Before Purchase

Check Product Description:

• Dyeing method indicated
• Fastness grade indicated
• Washing precautions

Ask Questions:

• Contact manufacturer
• Confirm dyeing method
• Request fastness grade

After Purchase

Simple Tests:

1. Wash Test

• Cut small piece
• Soak in hot water
• Together with white cloth
• Check after 30 minutes

2. Rubbing Test

• Rub with white cloth
• Both dry/wet states
• Check if it transfers

3. Light Test

• Expose small piece to sunlight
• Cover part of it
• Compare after 1-2 weeks

Interpreting Results

Good Fabric:

• Almost no color in water
• No transfer when rubbed
• Little color change in sunlight

Bad Fabric:

• Water becomes colored
• Color transfers to white cloth
• Fades quickly in sunlight

How to Maintain Color Fastness

When Washing

Temperature:

• Cold water or below 30°C
• High temperature accelerates color loss

Detergent:

• Mild detergent
• No bleach ingredients
• Color-protect detergent recommended

Method:

• Wash inside out
• Separate by color
• Short duration
• Gentle agitation

First Wash:

• Always wash separately
• Use cold water
• Add 1 tablespoon vinegar (color fixing)

When Drying

Air Drying:

• Dry in shade
• Avoid direct sunlight
• Dry inside out

Dryer:

• Low temperature
• Short duration
• Avoid high heat

When Storing

Direct Sunlight:

• Avoid sunlight
• Especially bright colors

Moisture:

• Well-ventilated area
• Moisture causes mold

Long-term Storage:

• Dark place
• Breathable cover

When Using

Friction Caution:

• Don't rub on rough surfaces
• Caution with bag straps, etc.

Sweat:

• Wash quickly after sweating
• Leaving long causes discoloration

Color Fastness Importance by Project

Clothing

Importance: Very High

Reasons:

• Frequent washing
• Contact with sweat
• Long-term use

Recommended:

• Wash fastness: Grade 4 or higher
• Perspiration fastness: Grade 4 or higher
• Rubbing fastness: Grade 4 or higher

Bedding

Importance: Very High

Reasons:

• Frequent washing
• Long skin contact
• Absorbs sweat

Recommended:

• Wash fastness: Grade 4-5
• Rubbing fastness: Grade 4-5

Curtains

Importance: High

Reasons:

• Sunlight exposure
• Infrequent washing

Recommended:

• Light fastness: Grade 5 or higher
• Wash fastness: Grade 3-4

Cushion Covers

Importance: Medium

Reasons:

• High friction
• Low washing frequency

Recommended:

• Rubbing fastness: Grade 4 or higher
• Wash fastness: Grade 3-4

Bags

Importance: Medium

Reasons:

• High friction
• Almost never washed

Recommended:

• Rubbing fastness: Grade 3-4
• Light fastness: Grade 4 or higher

Frequently Asked Questions

Q: Does reactive dye printing always have high fastness? A: Generally grade 4-5, but can vary based on dye quality and processing. Choose products from professional companies.

Q: Is dark jeans bleeding due to low fastness? A: Jeans intentionally have lower fastness for vintage effect. If you don't want bleeding, choose wash-specific jeans or wash multiple times initially.

Q: Is there a way to improve low-fastness fabric? A: It's difficult to improve fastness of already-dyed fabric. Being careful when washing is the best approach.

Q: Are color fixers effective? A: They help to some extent but aren't fundamental solutions. Better to choose high-fastness fabric from the start.

Q: Does dry cleaning prevent color fading? A: Dry cleaning is better for color retention than water washing, but must check dry cleaning fastness too.

Color Fastness Checklist

Before Purchase

• ☑ Check dyeing method (reactive dye recommended)
• ☑ Verify appropriate fastness grade for intended use
• ☑ Check manufacturer reliability
• ☑ Check reviews

After Purchase

• ☑ Conduct simple tests
• ☑ First wash separately
• ☑ Verify proper washing method

During Use

• ☑ Cold water washing
• ☑ Shade drying
• ☑ Avoid direct sunlight
• ☑ Separate washing by color

Color fastness is a crucial factor determining fabric quality. No matter how beautiful the design, it's meaningless if color fades. Especially for products intended for long-term use, choose high-fastness dyeing methods like reactive dyes, and maintain color long-term through proper washing and storage.