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

Bole Almagra Sil Atticum Terra Sinopica &c They Are Rather

hues and tints than definite colours, or more properly belong to the
tertiary, semi-neutral, and broken colours. As a rule they are native
pigments, found in most countries, and very abundantly and fine in our
own; but some are products of manufacture, and obtainable in the variety
of nature by art.

The colouring matter of these earths is the red oxide of iron, as that
of the yellow ochres is the yellow oxide. All the yellow ochres are more
or less reddened by being burnt, as yellow oxide of iron itself becomes
red on calcination. It was observed in the fourth chapter that time has
often the effect of fire, more or less intense; and hence it is that
yellow ochres occasionally assume a buffish-red hue, by the gradual
peroxidation of the iron. Similarly, if a yellow ochre be but partially
calcined, the red so obtained is apt to deepen or darken. Especially do
these changes take place when the iron oxides are not associated with an
earthy base; when, in fact, the so-called ochres cannot be classed as
such. In this case, too, as was lately remarked, the pigments are more
chemically active, and more likely to affect those colours to which iron
is inimical.

TTITLE RED OCHRE





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