Standard Depth Scales. As the fastness of dyeing depends on the depth of colour it is necessary to specify standard depths when making comparisons. Dye manufacturers pattern cards refer to these depths in fastness ratings for their products.SDC standard depths are illustrated in a range of 6 steps each from 2/1 to 1/25 depth over a range of 18 hues plus 2 navies and 2 blacks.
对应标准：
BS1006，AATCC EP4，ISO105 A01
类似标准：《染料染色标准深度色卡2/1 1/3 1/6 1/12 1/25(GB/T 4841.3-2006)》
(下图来源：向力仪器实物拍摄)
