Most Viewed

- Browns And The Cold Semi-neutral Grays Marrone Is Practically To
- Also Called Scarlet Chrome Is A Bright Chromate Of Lead Of An
- Black Chalk
- Composition Chemical Analysis Has Shown Several Of The Blues To Be
- Burnt Verdigris
- Belong The Dutch And Flemish Schools; The Sensible Which Aims At
- Less Known As English Red Prussian Red And Scarlet Ochre True
- Olive In Dark Green; Russet And Citrine In Dark Orange The
- Known Likewise As Raw Sienna Earth Terra Di Sienna &c Is A
- Root Of The Anchusa Tinctoria Commonly Known As Alkanet A Plant

Least Viewed

- Their Chief Source The Greens Consist Of Yellow Mixed With Copper
- Only That Of Extreme Light Objects Opaque It Follows That White Is To
- To Which The Various Appellations Have Been Given Of Thenard's Blue
- Thallium Orange
- Distilled Verdigris Or More Properly Refined Verdigris The Best Is
- Molybdenum Green
- Red And Blue In The Proportions Of Five Of The Former To Eight Of
- Violet De Mars Purple Ochre Or Mineral Purple Is A Dark Ochre
- Uniform Colour Thus Composed Is The Citrine Colour Of Fruit And
- Also In The Olive Foliage Of The Rose-tree Formed In The Individual

Prussian Black

The same Prussian blue which gives a brown when burnt in the open air,
yields a black when calcined in a close crucible. Very intense, very
soft and velvety, and very agreeable to work, this bluish-black dries
much more promptly than most other blacks, and scarcely requires
grinding. On account of its extreme division, however, it would probably
be found more energetic as a decolourising agent in admixture with
organic pigments than most carbonaceous blacks.

Another Prussian black, containing copper, and made by a wet process, is
obtained when a dilute solution of cupric sulphate and ferrous sulphate,
in proper proportions, is mixed with a quantity of ferrocyanide of
potassium not in excess. A very bulky deep black precipitate is formed,
which is difficult to wash, and is deep black when dry. It is insoluble
in water, and appears to be a compound analogous to Prussian blue. As a
pigment, this black is inferior to the preceding.





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