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

- Sometimes Called China Or Chinese Ink Is Chiefly Brought From
- Red On The One Hand And Of The Middle Tertiary Russet On The
- Distilled Verdigris Or More Properly Refined Verdigris The Best Is
- Molybdenum Green
- Uniform Colour Thus Composed Is The Citrine Colour Of Fruit And
- Or Lamblack Is A Smoke Black Being The Soot Procured By The Burning
- While We Avoid The Compounding Of Contrasting Colours That Is The
- Only That Of Extreme Light Objects Opaque It Follows That White Is To
- And By Mixing Colours Or Tints With Black He Gets Shades It Is A
- Secondary Colours Are Three Only Orange Green And Purple

Very Slight Solubility In Water Would Be A Fatal Objection; And

although they would be liable to suffer from a foul atmosphere, we are
inclined to think the effects would not be so lasting as in the
chromates of lead. Like lead sulphide, the sulphide of thallium ranges
from brown to brownish-black, or grey-black; and, like it too, is
subject to oxidation and consequent conversion into colourless sulphate.
It is, however, much more readily oxidized than sulphate of lead; and
hence the thallium chromates would doubtless soon regain their former
hue on exposure to a strong light.

Mr. Crookes, who discovered this new metal in 1861, believes that the
deep orange shade observable in some specimens of sulphide of cadmium is
due to the presence of thallium. He has frequently found it, he says, in
the dark-coloured varieties, and considers the variations of colour in
cadmium sulphide to be owing to traces of thallium. That thallium
affects the colour is most probable, but it is not necessarily the cause
of the orange hue. The tint of cadmium sulphide is a mere matter of
manufacture, seeing that from the same sample of metal there can be
obtained lemon-yellow, pale yellow, deep yellow, orange-yellow, and
orange-red. With deference to the opinion of a chemist so distinguished,
we hold that thallium rather impairs the beauty of cadmium sulphide than
imparts to it an orange shade, the thallium being likewise in the form
of sulphide, and therefore more or less black. On chromate of cadmium,
made with bichromate of potash, thallium would naturally confer an
orange hue.





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Previous: Thallium Orange

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