Definition of Ptisi. Meaning of Ptisi. Synonyms of Ptisi
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Definition of Ptisi
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Baptisia tinctoria 2. (Chem.) A blue dyestuff obtained from several plants
belonging to very different genera and orders; as, the
woad, Isatis tinctoria, Indigofera tinctoria, I.
Anil, Nereum tinctorium, etc. It is a dark blue earthy
substance, tasteless and odorless, with a copper-violet
luster when rubbed. Indigo does not exist in the plants as
such, but is obtained by decomposition of the glycoside
indican.
Note: Commercial indigo contains the essential coloring
principle indigo blue or indigotine, with several other
dyes; as, indigo red, indigo brown, etc., and various
impurities. Indigo is insoluble in ordinary reagents,
with the exception of strong sulphuric acid.
Chinese indigo (Bot.), Isatis indigotica, a kind of woad.
Wild indigo (Bot.), the American herb Baptisia tinctoria
which yields a poor quality of indigo, as do several other
species of the same genus.
