There are two perborate fabrics available and they are termed P1 & P2. Fabric P1 will change colour from royal blue to a dull green in the presence of peroxy compounds.
Fabric P2 will show no colour change in the presence of a peroxy compound. They are used to determine the presence of peroxy compounds in wash test such as ISO 105 C06.
These are a set of three dyed fabrics each with a different sensitivity to the bleach activator TAED. They are available in three levels of sensitivity:
They are used to check the presence of TAED in the following tests: