Die Wollfarbstoffe des Jahres 1913 = Wool colours 1913 = Les colorants pour laine de l'année 1913
A 1913 trilingual swatch book in German, English and French issued by the Bayer Company in New York for dyers and textile trades, showing wool samples dyed with named acid and chrome dyes. The pictures are plain photographs of hanks of wool in red, brown and near-black, each labelled with its dye percentages, giving a designer a record of how mordant and chrome treatments shift colour across a single fibre.
