Paint Its Colouring Matter Or Anchusin Has The Character Of A Resin
: ON THE SECONDARY, PURPLE.and is dark-red, softened by heat, insoluble in water, soluble in
alcohol and alkalis, and freely so in ether, fats, and volatile oils, to
all of which it imparts a brilliant red hue. To obtain anchusin, all the
soluble matters are first abstracted from the bruised root by water: it
is then digested in a solution of carbonate of potash, from which it may
be readily precipitated by an acid. Its alcoholic solution yields with
different reagents crimson, flesh-coloured, blue, and violet
precipitates, none of which, however, can be classed as durable. The
variety under notice, violet carmine, resembles the other colours
afforded by alkanet in not being able to withstand the action of light.
On continued exposure, it loses its beauty and brightness, together with
much of its colour, and, like Indian purple, assumes an inky blackness.
Hence it is unsuited to permanently pure effects, and should only be
used in body.
* * * * *
More
-
Or L500 For The Production Of Artificial Ultramarine By The Societe
... Or Lamblack Is A Smoke Black Being The Soot Procured By The Burning
of resins or resinous woods. It is a pure vegetal charcoal of fine texture, not quite so intense nor so transparent as the black made from ivory, but less brown in its pale tones. It has a very strong body that covers readily every underlay of colour,... Or Masticot Is A Protoxide Of Lead Varying From The Purest And Most
tender straw colour to a dull orange yellow, and known as Light, Yellow, and Golden Massicot. It has in painting all the properties of white lead, from which it may be prepared by gentle calcination in an open furnace. In tint with that pigment, howev... Or Mineral Grey As It Is Often Improperly Spelt Is Obtainable From
the lapis lazuli, after the blue and ash have been worked out. So derived, it is a refuse article, worthless if the stone has been skilfully exhausted of its ultramarine. As this is now generally the case, the best mineral gray is no longer a waste pr... Or More Correctly Semi-neutral Tint Is A Compound Shadow Colour Of
a cool character. It is permanent, except that on exposure the gray is apt to become grey, a change which may be prevented by a slight addition of ultramarine ash. So protected, it becomes serviceable in landscape for the extreme distance, which, it m... Or Mountain Green Is Met With In Cumberland And Is Also Found In The
... Or Penley's Neutral Orange Is A Permanent Compound Pigment Composed
of yellow ochre and the russet-marrone known as brown madder: it is chiefly valuable in water-colour. Paper, being white, is too opaque to paint upon, without some wash of colour being first passed over it; otherwise the light tones of the sky are apt... Or Queen's Yellow Is A Subsulphate Of Mercury Of A Beautiful Lemon
yellow colour, but so liable to change by the action of light or impure air, that it cannot be used safely, and hardly deserves attention as a pigment. ... Or Quercitron Yellow Is What Its Name Implies It Is Dark In
substance, in grains of a glossy fracture, perfectly transparent, and when ground is of a beautiful yellow colour. In painting it follows, and adds richness and depth to, gamboge in water, and goes well into varnish; but any lead used in rendering oil... Or Rouge De Mars Is An Artificial Iron Ochre Similar In Subdued Tint
and permanence to the native earths. Its chemical affinities, however, are greater than those of the latter, and it therefore requires to be employed cautiously with pigments affected by iron. In this respect the red resembles its compeers, Mars yello... Or Swedish Green Resembles The Preceding Variety In Being A Compound
of copper and arsenic, and therefore rankly poisonous; but differs from it in containing no acetic acid, in possessing less opacity, and in having a darker shade. It is a cupric arsenite, with the common attributes of emerald green, under which name i... Or Viride Aeris Is Of Two Kinds Common Or Impure And Crystallized Or
... Orange As Well As Its Relatives Scarlet And Other Warm Colours
... Orange Chrome Or Orange Chromate Of Lead Is A Sub-chromate Of Lead
of an orange-yellow colour, produced by the action of an alkali on chrome yellow. Like all the chromates of lead, it is characterized by power and brilliancy; but also by a rankness of tone, a want of permanence, and a tendency to injure organic pigme... Orange De Mars Is A Subdued Orange Of The Burnt Sienna Class But
without the brown tinge that distinguishes the latter. Marked by a special clearness and purity of tone, with much transparency, it affords bright sunny tints in its pale washes, and combines effectively with white. Being an artificial iron ochre it i... Orange For Instance Which Is Naturally An Orange Pigment And Not
composed of red and yellow, is superior to many mixtures of those colours in a chemical sense, and to all such mixtures in an artistic sense. At the same time, it is quite possible for the artist to multiply his pigments unnecessarily. Colours are som... Orange Russet Russet Rubiate Or Field's Russet This Is A Very
rich crimson russet with a flush of orange; pure, transparent, and of a middle hue between orange and purple. Prepared from the madder root, it is not subject to change by the action of light, time, or mixture of other pigments. Although not so much e... Orange Vermilion
TTITLE VERMILION, Deep or pale, when well made and pure is of strict permanence, not sensibly affected by light, time, or foul air; and eligible either in water, oil, or fresco. For an enamel colour it is unsuited, being dissipated at a red heat,... Otherwise Called Berlin Blue Paris Blue Prussiate Of Iron
... Oxide Of Manganese Which Gives The Red Hue And That Of Cobalt Which
... Paint Its Colouring Matter Or Anchusin Has The Character Of A Resin
and is dark-red, softened by heat, insoluble in water, soluble in alcohol and alkalis, and freely so in ether, fats, and volatile oils, to all of which it imparts a brilliant red hue. To obtain anchusin, all the soluble matters are first abstracted fr... Pale Chrome And Deep Chrome Are Chromates Of Lead In Which The
latter metal more or less exists, according to the paleness or depth of the colour. Of modern introduction, they are distinguished for their brilliancy, their opacity and body, and their going cordially into tint with white, both in water and oil. Owi... Pale Vermilion Scarlet Vermilion Chinese Vermilion Carmine
... Peculiar Red Mineral Orange
... Pickle Green &c
The general characteristics of these greens are brightness of colour, well suited to the purposes of house-painting, but seldom adapted to the modesty of nature in fine art; considerable permanence, except when exposed to the action of damp and impu... Picture--that Picture Which May Meet With Foul Exhalations But Must
be exposed to light and air. And he too often thinks as little of the effects of an impure atmosphere or injudicious admixture, as the chemist considers the action of air and light. ... Pigment Says The Chemical News Supplies A Desideratum Hitherto In
vain sought for by artists. It is the nearest approach to a perfect yellow in existence, and more closely resembles the purity of the prismatic spectrum than any other artificial colour. It is transparent, has great brilliancy and richness, both pure ... Pigment The [greek: Kinnabari] Of The Greeks And The Minium--a Term
now confined to red lead--of older writers. Pliny states that it was so esteemed by the Romans, as to have its price fixed by express law of state. Among other places, the natural product is met with in California, Spain, and Peru; and in China there ... Pigments And Bases Are Subject To Deoxidation Or To A Loss Of Oxygen
in which case the colour is apt to deepen. Pigments generally are more affected by oxidation and fading in a water vehicle, and by deoxidation and darkening in one of oil. A principal test of permanency in pigments is the impunity with which they b... Pigments Of Whose Thorough Durability There Is No Doubt Comes The
... Pitch And [greek: Kallos] Ornament The Blue Is Named Pittacal
The mode of separating pittacal has not been clearly described. Dumas states, that when precipitated in a flocculent state from its solutions, or obtained by evaporation, it closely resembles indigo, and, like it, acquires a coppery hue when rubbed.... Plumbago Or Graphite Contains In Spite Of Its Name No Lead Being
simply a species of carbon or charcoal. In most specimens iron is present, varying in quantity from a mere trace up to five per cent, together with silica and alumina. Sometimes manganese and titanic acid are likewise found. It is curious that carbon ... Poppy &c: In Gold Colour &c It Leans Towards Yellow Combined
... Pre-eminently A Warm Colour Being The Equal Contrast Of Or Antagonist
... Predominates To The Eye Constitute The Negative Or Neutral Colours
... Primary Blue Yellow Furnishes All The Variety Of The Secondary
... Primary Colours Are Three Only Yellow Red And Blue They Are
such as yield others by being compounded, but are not themselves capable of being produced by composition of other colours. By way of distinction, they are occasionally designated "entire" colours. ... Primary Yellow The Secondary Orange Or The Tertiary Citrine With
... Principle Under The Name Of Wongshy And Consisting Of The
seed-capsule of a species of gentian. The aqueous extract, freed from the pectin which it contains, yields with baryta- and lime-water yellow precipitates, from which acids separate the colouring matter of a vermilion hue. When thus prepared it is ins... Produced By A Thin Wash Of Black Over White The Neutral Grey Differs
...