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

- Distilled Verdigris Or More Properly Refined Verdigris The Best Is
- Uniform Colour Thus Composed Is The Citrine Colour Of Fruit And
- Sometimes Called China Or Chinese Ink Is Chiefly Brought From
- Their Chief Source The Greens Consist Of Yellow Mixed With Copper
- Egypt The Greeks Obtained The Knowledge Of Their Ars Chromatica
- While We Avoid The Compounding Of Contrasting Colours That Is The
- Only That Of Extreme Light Objects Opaque It Follows That White Is To
- Secondary Colours Are Three Only Orange Green And Purple
- Colours With The Neutral Black Of The Various Combinations Of Black
- Have To Be Learnt For Each Pigment Has Its Own Peculiar Habitudes

Persulphomolybdates

The metallic compounds formed by the combination of persulphomolybdic
acid with a base are pulverulent, in many cases of a red colour, and for
the most part insoluble in water. With barium, the acid furnishes a
yellowish-red powder, insoluble in, but made denser by water, which
imparts to it a cinnabar colour. With calcium it is said to yield a
scarlet, sparingly soluble in water. With chromium, uranium, lead,
platinum, and copper, it gives a dark red; that from the last metal
turning brown when collected on a filter. It likewise produces reds with
zinc, cadmium, iron, mercury, and tin; of which the last is slightly
soluble in water.

Molybdenum being a rare metal, and persulphomolybdate of potash, the
salt used in the foregoing reactions, difficult to prepare, it is
unlikely that the colours named will rank among the pigments of this
generation. Nevertheless, as we have observed before, such fancy
products should not be altogether ignored, it being quite as well to
have some knowledge of our resources, even though those resources be not
at present available. All the rare metals afford coloured compounds:
tantalum, niobium, pelopium, vanadium, tellurium, titanium, yttrium,
lanthanum, didymium, glucinum, cerium, thorinum, zirconium, palladium,
rhodium, iridium, ruthenium, osmium, indium, thallium, &c.; and it is
just possible that some of these may one day scrape acquaintance with
the palette.





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Previous: Peganum Harmala

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