from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An oily liquid hydrocarbon extracted from the creosote of beechwood tar, and consisting essentially of certain derivatives of pyrogallol.
from the GNU version of the Collaborative International Dictionary of English
- n. An oily liquid hydrocarbon extracted from the creosote of beechwood tar. It consists essentially of certain derivatives of pyrogallol.
from The Century Dictionary and Cyclopedia
- n. The biter principle of tar. It can be separated in the form of a colorless oil.
Picamar blue is produced when a few drops of baryta-water are added to an alcoholic solution of impure picamar, or even to wood-tar oil deprived of its acid.
At present wood-tar is comparatively unexplored, but the fact that picamar furnishes a blue is at least as suggestive and hopeful as that transient purple colouration by which aniline was once chiefly distinguished.
Both are distinguished by coloured tests, but there is this advantage in the picamar blue -- it is comparatively permanent.
As aniline is a product of coal-tar, so picamar is a product of wood-tar; and as the former gives a purple with hypochlorites, so the latter yields a blue with baryta-water.