Definitions
from The Century Dictionary.
- noun The biter principle of tar. It can be separated in the form of a colorless oil.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Chem.) An oily liquid hydrocarbon extracted from the creosote of beechwood tar. It consists essentially of certain derivatives of pyrogallol.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun organic chemistry An
oily liquid hydrocarbon extracted from thecreosote ofbeechwood tar , and consisting essentially of certainderivatives ofpyrogallol .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
Support
Help support Wordnik (and make this page ad-free) by adopting the word picamar.
Examples
-
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.
Field's Chromatography or Treatise on Colours and Pigments as Used by Artists George Field
-
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.
Field's Chromatography or Treatise on Colours and Pigments as Used by Artists George Field
-
Both are distinguished by coloured tests, but there is this advantage in the picamar blue -- it is comparatively permanent.
Field's Chromatography or Treatise on Colours and Pigments as Used by Artists George Field
-
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.
Field's Chromatography or Treatise on Colours and Pigments as Used by Artists George Field
Comments
Log in or sign up to get involved in the conversation. It's quick and easy.