Aspects of this topic are discussed in the following places at Britannica.
...of ingrain dyeing, whereby the dye is synthesized within the fabric (see above Dyeing techniques: Azo dyeing techniques). Since the process was done at ice temperature, some dyes were called ice colours. In 1912 it was found that 2-hydroxy-3-naphthanilide (Naphtol AS, from the German Naphtol Anilid Säure) forms a water-soluble anion with...
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