What does Crocking mean in fabric?

Crocking refers to the rubbing off of color from a fabric when subjected to abrasion. One test is the AATCC 8-2001. This “is a test method of the American Association of Textile Chemists and Colorists (AATCC). This method uses a standard white cotton fabric that is rubbed against the surface of the test fabric.

What is fastness to light?

Light fastness, or color fastness to light, is the resistance of printed or pigmented materials to fading or color change due to exposure to sunlight or an artificial light source.

What is good color fastness?

The term is usually used in the context of clothes. In general, clothing should be tested for colour fastness before using bleach or other cleaning products. ... The light fastness of textile dye is categorized from one to eight and the wash fastness from one to five, with a higher the number indicating better fastness.

Why color fastness properties is important for fabric?

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.

What does it mean for a dye to run chemistry?

A dye will run if it has a weak affinity for the material it is attached to, or a much stronger affinity for a non-aqueous solvent. Detergents may cause running because they help to stabilise the hydrophobic regions of dye molecules due to their ability to form micelles.

What does lightfast mean in paint?

Lightfastness – The lightfastness of a paint color or pigment is how permanent it is, or how unaffected it is by light. Gamblin Artist's oil colors are rated according to the American Society for Testing and Materials (ASTM) LIGHTFASTNESS KEY: I – Excellent lightfastness.

Why do vat dyes possess excellent fastness to washing?

The large vat dye molecule is trapped within the polymer system of the fibre because of its size and aqueous insolubility and it is absorbed within the fibre polymer system by van der Waals forces. The excellent wash-fastness of vat dyes is attributed to the aqueous insolubility and large size of their molecules.

What is multifiber fabric?

Special multifiber fabric containing strips of wool, acrylic, polyester, nylon, cotton and acetate. The brilliant color patterns produced by different dyes on the one yard of multifiber fabric teach students about the structures of dye and fabric molecules and the types of bonding interaction between them.

What does the word fastness mean?

noun. a secure or fortified place; stronghold: a mountain fastness. the state of being fixed or firm: the fastness of democratic institutions. the state of being rapid.

What is the Colour fastness of the fabric?

Colour fastness is the resistance of a material to change in any of its colour characteristics, including the transfer of its colourants to adjacent materials; Fading means the colour changes and lightens; Bleeding is the transfer of one colour to another material. This is often expressed as soiling or staining.

How does color fastness affect sewing thread?

Good color fastness of the thread makes it resistant to the various chemical and physical agents the thread is exposed to during manufacturing and during its useful life specially during washing, perspiration, sublimation, etc. This ensures no bleeding of the color into the garment.

How will you determine the Colour fastness of a dyed textile to perspiration?

The main machines used in washing color fastness are Washing Color Fastness Testers. Generally, there are two indicators measured in washing Color Fastness test, including testing fade of original sample and staining of white cloth. Fade of original sample is the color change of dyed textiles before and after soaping.

What is rubbing fastness?

Rubbing fastness refers to the resistance of the color of textiles to abrasion or staining to other textiles. As a rule, dark colors achieve lower rubfastness than light colors.

What is GREY scale rating?

​Grey Scales (Gray Scales) are used for assessing colour change and staining during colour fastness testing. Both scales are used for visual assessment to enable you to specify a rating from 1 to 5, with 5 being 'good' and 1 being 'poor'.

How do you test light fastness?

At its simplest, this test can be accomplished by applying the material to be tested to a suitable support, cutting the sample in half, and exposing part of the test specimen behind a window that provides as much sunlight as possible, while keeping the other half shielded from all light sources.

What is color fastness in leather?

The light fastness of a material describes its resistance to fading by light, in particular by the constant radiation of UV light. Among the types of leather, aniline-coloured porous leather is especially at risk of losing its original hue. The more engineered pigmented leather is less prone to this phenomenon.

What is a lightfast rating?

The lightfast rating indicates the items resistance to fading, which has been tested under museum conditions. Star Ratings: *** = Maximum lightfastness = 7 ,8 Blue Wool Scale. Maximum fade resistance (100 + years)

What does lightfast ink mean?

Definition of LIGHTFAST INKS:

Inks that are designed to resist fading when exposed to natural or artificial lighting. ... Lightfast inks are usually chosen when the final product is to be stored or used outside or near to an artificial light source that could cause fading.

What does UV 5/8 blue scale mean?

On the Blue Wool Scale the lightfastness is rated between 1–8. 1 being very poor and 8 being excellent lightfastness. ... 1 being very poor and 5 being excellent lightfastness. On ASTM scale the lightfastness is rated between I-V.