Blue scale is a standard comparative scale from 1 to 8 (1=very poor, 8=excellent)which is used for assessing the light fastness of printed or dyed fabrics and textiles (1 = very poor, 8 = excellent). It consists of 8 standards blue dyeing on smooth wool fabric with varying degrees of sensitivity to the action of daylight or artificial light. Read more..
Flannel is a brushed, pliable fabric of twill, wool, worsted, cotton or rayon made in tightly woven twill or plain weave and finished with a light napping. Flannel originated in Wales and has a soft, napped surface that partially cancels the weave. Read more..
Indigo – the primary use for indigo is as a dye for cotton yarn, which is mainly for the production of denim cloth for blue jeans. On average, a pair of blue jean trousers requires 3 – 12 g of indigo. Small amounts are used for dyeing wool and silk. Read more..