Popular Mechanics, marraskuu 1913
Fast-black ad fast-gray cotton-cloth prints can now be made by the use of a dyeing mordant that has just been patented. Any shade from light gray to deep black, if printed on cotton or any vegetable fiber with the new dye, cannot be faded by washing or by sunlight; but the same mordant will not make a fast black on woolen cloth. Cotton cloth that is printed with this new dye can be identified by the fact that it yields red to violet solutions in concentrated acid.
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