1) Alcohol: used to dissolve dyes without heating; cold solution method. For some insoluble dyes can be added urea or thiodiethanol solution.
(2) NaOH: Caustic soda produces sodium salt and dissolves in water, but the amount can not be too much, the amount is more, the stability of the color paste is good, but it causes poor coloring, so the amount should be properly controlled.
(3) Neutral red germanium liquid: It is an oxidant that is used to resist the damage of the reducing gas to the dye when steaming. For chromochrome red B and chromochrome RL, because the benzene nucleus contains a nitro group that is sensitive to the reducing agent, the amount of oxidizing agent can be increased, while for the yellow cultivar, the oxidizing agent can not be added to prevent the color from becoming dark.
Source: Dongguan Printing Network
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