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
- Sometimes Called China Or Chinese Ink Is Chiefly Brought From
- 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
- These Are False Appellations Of A White Lead Called Also French
- Of These There Are Three Tints Deep A So-called Pale And Lemon

Haerlem Blue Berlin Blue Mineral Blue Is A Lighter And

somewhat brighter Prussian blue, with less depth and less permanence. It
is a species of lake, having a considerable proportion of aluminous
base, to which its paler tint is due. As the stability of Prussian blue
rests in a great measure on the marvellous amount of latent colour the
pigment contains, when its particles of colour are set farther apart by
the intervention of the alumina, the permanence of its hue is
endangered. It was remarked, with respect to vitrified pigments, that
colour depends on cohesion. More or less, this holds good as regards all
pigments; but not only, as was also observed, does colour rest on
cohesion, in many instances durability depends likewise. It is only when
a colour is stable in itself that its particles will bear separating:
native ultramarine, for example, may be weakened almost to white, and
will still preserve its hue. If, however, a colour be naturally
fugitive, and rely chiefly on its extreme depth for what permanence it
possesses, that colour cannot with impunity be paled: witness the
cochineal lakes, which the deeper they are, the more durable they are
found; and so it is with Prussian blue. Antwerp blue is distinguished
from the latter by its more earthy fracture.
TTITLE
131. TURNBULL'S BLUE,





Next: Or Ferricyanide Of Iron Is Formed By Adding The Red Prussiate Of
Previous: Variety Of This Pigment Known As Native Prussian Blue; Which Is

			Report Privacy
	SHARE	BOOKMARK

Viewed 338