A substrate being hard to dye can be easily dyed a desire color, by applying a special dyebath containing concentrated sulfuric acid. All inorganic and organic materials may be instantly dyed a desire color, so far as those having a greater surface area are concerned.
The substrates being most hard to dye such as carbon black, polypropylene, polyvinyl chloride, polyvinilidene chloride, etc., may be quickly dyed a beautiful color, by this dyeing process.
Insoluble coloring materials, such as vat and sulfur colors, or pigments, are the most suitable for this process. These can be applied as molecular solutions. Therefore, a beautiful color can be satisfactly developed. Also, this new dyeing process can be applied to soluble coloring materials. In this case, an organic acid is useful as a component in the dye bath.
A special dyebath consisting of concentrated sulfuric acid and with the regular amounts of surface active agent and organic solvent which have an emulsified state may be used effectively for quick dyeing on the most hard to dye. This special dyebath has a greater dye-accessibility for the substrates being hard to dye.
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