Assertion: coloring material | /r/HasProperty | extracted by chemical means
Facets:
value: from vegetable materials
type: OTHER
Source sentences:
text: Also, it has been observed, with regard to the natural coloring materials first used and constituted notably by plant extracts obtained by physical means, that there is more and more competition on the one hand, from synthetic coloring materials whose cost price is often lower, supplies being independent of climatic conditions, the variety of colors being greater and the stability being more marked, and on the other hand, from coloring materials extracted from vegetable materials by chemical means, which just as synthetic coloring materials, guaranty a given coloring power per unit weight.