What is Color Fastness | Classification of Color Fastness | Different Types of Color Fastness | What is Crocking | Define Crocking

What is colorfastness:
We can define colorfastness as, having color that will not run or fade with washing or wear. That means characterizes a material's color's resistance to fading or running. Clothing is colorfast if its colors and dyes do not bleed or run from the clothing. Clothing should be tested for colorfastness before using any type of bleach or bleaching solution, or strong cleaning product. Colorfastness is very important factor for buyer. Colorfastness properties of textiles are an important measure of quality of a product.

To test for colorfastness, find a hidden seam of the garment or an hidden spot. Apply the cleaner to the garment and then dab the area with a clean cotton cloth.

If the color removes itself from the garment onto the cloth, you should not use the cleaning product on the clothing.

Importance of color fastness:
Textile fabric has many properties. Colorfastness property is one of the most important properties of them. It is a property of a colorant which allows it to retain its different characteristics despite degradation conditions such as exposure to light and dry cleaning. Product performance and evaluation to determine if the fabric is suitable for the intended end use. It is a identity for fabric. If colorfastness is good then fabric quality high and if poor fastness property then fabric quality is bad. So, colorfastness is the important factor for the buyer to justify which fabric is bad and which is better.

Different Types of Color Fastness
There are various types of color fastness test for fabric. Important color fastness tests are given below:

  1. Color Fastness to Washing
  2. Color Fastness to light
  3. Color Fastness to perspiration
  4. Color Fastness to Water
  5. Color Fastness to Rubbing
  6. Color fastness to sea water
  7. Color fastness to hot pressing
  8. Color fastness to chlorinated water
The rubbing off of colors is called as crocking. Crocking is simply the transfer of color from a fabric onto another white test fabric. The more color is transferred, the more the fabric "crocks". Crocking determines the amount of color transferred from the surface of colored textile material to other surfaces by rubbing. The crock meter is used to find the color fastness to crocking.

crock meter
Fig: Crock meter
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Mazharul Islam Kiron is a textile consultant, entrepreneur, blogger and researcher on online business promotion. He is working as a consultant in several local and international companies. He is also a contributor of Wikipedia.

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