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Gray Scale
Gray Scale

Gray scale

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Gray Scale
Gray Scale

Gray Scale

  The Gray Scale is a visual tool used in the textile and dyeing industry to evaluate and grade the color change or staining of a fabric after testing (e.g., washing, rubbing, and light exposure). It helps assess how much a fabric's color has altered or transferred during durability or fastness tests. Types of Gray Scale:
  1. Gray Scale for Color Change - Compares the original and tested sample to measure color fading or alteration.
  2. Gray Scale for Staining - Compares a white adjacent fabric (before and after testing) to assess color transfer or staining.
Rating System : - Uses a 1 to 5 scale: - Grade 5: No change or staining (excellent) - Grade 1: Severe change or heavy staining (poor) Intermediate grades (like 4–5, 3–4, etc.) are also used for finer evaluation.   Construction :- Each scale includes pairs of gray chips with varying contrast levels to visually match the test results. Usage Areas:- Textile testing labs- Dyeing and finishing quality control- Standards like ISO, AATCC, and BIS tests   Benefits :
  1. Standardized Evaluation - Provides a consistent and objective way to assess color change or staining.
  2. Simple and Quick to Use - Enables rapid visual comparison during fabric testing.
  3. Widely Accepted - Complies with international standards (ISO, AATCC) for color fastness grading.
  4. Cost-Effective Tool - Inexpensive yet essential for reliable quality control in textiles.
 
  1. Enhances Quality Assurance - Helps detect dyeing or printing issues before bulk production.
  2. Supports Multiple Tests - Used for evaluating wash fastness, rubbing fastness, perspiration, light exposure, and more.
  3. Portable and Durable - Easy to carry and long-lasting with proper care.
Features :
  1. Dual Type Availability - Comes in two types: for Color Change and for Staining.
  2. 5-Point Grading System - Grades from 1 (poor) to 5 (excellent), with half-step intervals like 4–5, 3–4.
  3. Standardized Grey Chips - Includes contrasting grey color pairs to match fabric changes accurately.
  4. Compact Design - Small, portable card or booklet format for easy lab and field use.
 
  1. Durable Material - Made from stable, fade-resistant plastic or cardboard for long-term use.
  2. Compliance with Standards - Follows ISO 105-A02 (Color Change) and ISO 105-A03 (Staining) norms.
  3. Easy Visual Comparison - Designed for quick side-by-side assessment of fabric before and after testing.
  How to Use : Select the Right Gray Scale - Use Color Change scale to check fading, or staining scale to check color transfer.
  1. Place the Samples - Lay the untested (original) and tested fabric side by side (for color change)
- Or place the adjacent white fabric next to the gray scale (for staining).
  1. Match Against Gray Scale Chips - Visually compare the difference between the samples and find the closest matching gray pair on the scale.
 
  1. Assign a Grade
- Grade from 1 to 5, where: - Grade 5 = no change/staining - Grade 1 = severe change/staining - Use half-grades like 4–5 if needed.
  1. Record the Result - Note the grade in your test report as per the test method (e.g., ISO 105).
  2. Store Properly - Keep the gray scale away from light and moisture to avoid fading.
  3. Features :
    1. Dual Type Availability - Comes in two types: for Color Change and for Staining.
    2. 5-Point Grading System - Grades from 1 (poor) to 5 (excellent), with half-step intervals like 4–5, 3–4.
    3. Standardized Grey Chips - Includes contrasting grey color pairs to match fabric changes accurately.
    4. Compact Design - Small, portable card or booklet format for easy lab and field use.
  Categories:
  1. Gray Scale for Color Change - Used to evaluate the degree of color fading or change in a fabric after testing (e.g., washing, light exposure). - Assesses how much the original color has altered.
  2. Gray Scale for Staining - Used to assess the degree of color transfer from a dyed fabric to an adjacent white fabric during testing (e.g., rubbing, washing).
- Evaluates staining on undyed fabrics.   These two types are essential tools in color fastness testing across textile labs. Want to know which standard tests use each type?
Gray Scale

Gray Scale

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Perspiration Tester
Perspiration Tester

Perspiration Tester

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Perspiration Tester

Perspiration Tester

Perspiration Tester

  A Perspiration Tester is a lab device used to evaluate the colorfastness of textiles to artificial perspiration (sweat). It simulates the effects of human sweat—both acidic and alkaline—on dyed or printed fabrics under controlled temperature and pressure.   Purpose of Perspiration Tester: - To test how fabrics react to body sweat and determine whether dyes bleed, fade, or transfer onto adjacent materials.   Working Principle:
  1. Fabric samples are treated with synthetic perspiration solution (acidic or alkaline).
  2. They are sandwiched with adjacent fabric and placed between glass or acrylic plates.
  3. The assembly is loaded into the tester and pressed under specific pressure.
  4. it’s then incubated at 37°C (body temperature) for a fixed time (typically 4 or 16 hours).
  5. Afterward, color change and staining are evaluated using a gray scale.
  Applications of Perspiration Tester: - Garment and sportswear testing - Quality control in textile processing - Compliance with standards like ISO 105 E04, AATCC 15   Benefits of Perspiration Tester:
  1. Accurate Sweat Simulation - Mimics real-life effects of acidic and alkaline perspiration on fabrics.
  2. Improves Product Quality - Ensures textiles retain color and don’t bleed or stain when worn.
  3. Supports Standard Compliance - Follows ISO and AATCC test standards for global market approval.
  4. Protects Brand Reputation- Reduces customer complaints due to dye transfer or fading.
 
  1. Simple and Repeatable- Provides consistent pressure and conditions for reliable results.
  2. Multi-Sample Testing- Tests multiple specimens at once, saving time in labs.
  3. Durable and Low Maintenance- Robust frame with minimal moving parts makes it long-lasting and easy to care for.
  Features of Perspiration Tester:
  1. Stainless Steel Frame - Corrosion-resistant body for durability and long-term use.
  2. Multi-Sample Capacity - Can hold up to 20 or more specimens for batch testing.
  3. Standardized Loading Weight- Applies uniform pressure (usually 12.5 kPa) across all samples.
  4. Removable Plates - Glass or acrylic plates ensure even contact and easy cleaning.
 
  1. Compact Design- Space-saving, bench-top model ideal for lab environments.
  2. Complies with Test Standards - Meets ISO 105 E04, AATCC 15, and related perspiration fastness standards.
  3. Ease of Operation - Simple loading, unloading, and incubation process.
  4. High-Temperature Resistance - Can be used inside incubators at 37°C or ovens as required.
  How to Use a Perspiration Tester:
  1. Prepare the Test Solution - Mix artificial acidic or alkaline perspiration as per standard (ISO or AATCC).
  2. Cut the Fabric Samples - Cut both the test fabric and adjacent white fabric (usually cotton) to standard size.
  3. Soak the Samples - Immerse the fabric sandwich (test + adjacent) in the test solution for 30 minutes.
  4. Remove Excess Liquid - Gently squeeze or blot to remove extra moisture—do not dry.
 
  1. Load in the Tester- Place each sandwich between glass or acrylic separator plates in the tester.
  2. Apply Pressure - Tighten the top plate or place the standard weight on top to apply uniform pressure.
  3. Incubate - Keep the loaded tester in an oven or incubator at 37°C for 4–16 hours (depending on the method).
  1. Accurate Sweat Simulation - Mimics real-life effects of acidic and alkaline perspiration on fabrics.
  2. Improves Product Quality - Ensures textiles retain color and don’t bleed or stain when worn.
  3. Supports Standard Compliance - Follows ISO and AATCC test standards for global market approval.
  4. Protects Brand Reputation- Reduces customer complaints due to dye transfer or fading.
 
  1. Simple and Repeatable- Provides consistent pressure and conditions for reliable results.
  2. Multi-Sample Testing- Tests multiple specimens at once, saving time in labs.
  3. Durable and Low Maintenance- Robust frame with minimal moving parts makes it long-lasting and easy to care for.
  1. Dry and Evaluate - Remove, air dry the samples, then assess color change and staining using a gray scale.
  2. Fabric samples are treated with synthetic perspiration solution (acidic or alkaline).
  3. They are sandwiched with adjacent fabric and placed between glass or acrylic plates.
  4. The assembly is loaded into the tester and pressed under specific pressure.
  5. it’s then incubated at 37°C (body temperature) for a fixed time (typically 4 or 16 hours).
  6. Afterward, color change and staining are evaluated using a gray scale.
    Perspiration Tester

    Perspiration Tester

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