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Of The Bixa Orellana And Appears Generally To Contain Two Colouring
matters, a yellow and a red, which are apt to adhere to each other and produce orange. Anotta dissolves with difficulty in water, but readily in alcohol and alkaline solutions, from which last it may be thrown down as a lake by means of alum. Being, h... Of The Gold Coast The Cape And Natal Turacine The Name Proposed
for it, is noticed here only because it is the first animal or vegetable pigment, with copper as an essential element, which has been hitherto isolated. The colour is extracted by solution in an alkali, and precipitation by an acid, and is changed on ... Of These There Are Three Tints Deep A So-called Pale And Lemon
TTITLE DEEP CADMIUM. Cadmium Yellow is comparatively a recent introduction, the metal itself not having been discovered till 1818. The cadmium yellows of commerce are (the chromate excepted) all sulphides, and therefore not affected by impure air... Of Those Pigments Would Do The Rich Yellowness Entirely Disappearing
and the sober-coloured earth being left behind. * * * * * From several metals besides those mentioned, yellows more or less vivid and durable may be obtained--from tin, nickel, cerium, molybdenum, &c.; but we do not... Of Which Black And White Have Been Stated To Be The Opposed
... Olive And Is Also The Prime Colour Or Archeus Of The Neutral Black
... Olive In Dark Green; Russet And Citrine In Dark Orange The
tertiaries have, therefore, the same order of relation to black that the primaries have to white; and we have black primaries, secondaries, and tertiaries, inversely, as we have white primaries, secondaries, and tertiaries, directly. In other words, w... Once Known As Persian Red Is Brought From Bengal It Is A Natural
earth rich in peroxide of iron, of a purple russet hue and good body, and valued when fine for the clearness and soft lakey tone of its tints. In a crude state it is a coarse powder, full of extremely hard and brilliant particles of a dark appearance ... Only That Of Extreme Light Objects Opaque It Follows That White Is To
be kept as much as possible out of shadow, and black, for the same reason, out of colour. In their stead, whenever it is necessary to cover, opaque tints may be employed, glazed over with transparent colours. Such practice would also be more favourabl... Opacity Is A Fine Tone; But It Must Be Remembered That Transparency
is the character of the sunset or sunrise, and hence arises the difficulty of employing such opaque colour effectively." Before the introduction of cadmium red, this and the following pigment were the best and only unexceptionable orange-reds known. I... Opaque Contrary And Vice Versa: Indeed In Practice All These Must
be in some measure combined. Such are some of the powers of contrast in colouring alone, and such is the diversity of art upon which skill in colouring depends. It must not be forgotten, however, that contrasts or extremes, whether of light and sha... Opaque Oxide Of Chromium Green Oxide Of Chromium Chrome Oxide
... Or Brun De Mars Is Either A Natural Or Artificial Ochre Containing
iron, or iron and manganese. Of much richness and strict permanence, it resembles raw umber in being a brown with a citrine cast, but is generally marked by a flush of orange which is not so observable in the latter pigment. TTITLE MIXED CITRINE. ... Or Burnt Terra Di Sienna Is Calcined Raw Sienna Of A Rich
transparent brown-orange or orange-russet colour, richer, deeper, and more transparent than the raw earth. It also works and dries better, has in other respects the qualities of its parent colour, and is a most permanent and serviceable pigment in pai... Or Cappagh Brown Is Likewise A Colour Peculiar To Oil It Is A
species of bog-earth or peat, mixed with manganese in various proportions, and found on the estate of Lord Audley at Cappagh, near Cork. The specimens in which the peat earth most abounds are of light weight, friable texture, and dark colour; while th... Or Carmine Vermilion Partakes Of A Crimson Hue And Is Adapted
mixed with white, for the rose and lilac-tints of some complexions. Like other vermilions, however, the colour needs much nicety of management; and it must not be attempted to further enrich it by admixture of cochineal lakes. Those colours, as we hav... Or Coeruleum Under The Name Coelin There Has Of Late Years Been
imported from Germany the cobalt blue with a tin base to which reference has just been made. This comparatively new pigment--which likewise contains or is mixed with gypsum, silica, and sometimes magnesia--has the distinctive property of appearing a p... Or Ferricyanide Of Iron Is Formed By Adding The Red Prussiate Of
potash to a protosalt of iron. This blue is lighter and more delicate than ordinary Prussian blue, and is believed to resist the action of alkalies longer. It is a question whether the common Prussian blue obtained by oxidizing the precipitate yielded... Or Field's Carmine Like That Of Cochineal Is The Richest And Deepest
lake prepared, containing most colouring matter and least base. It differs from the paler products chiefly in transparency and intensity, and is the only durable carmine for painting either in water or oil; for both which it is qualified by texture wi... Or French Blue Is A Rich Deep Colour But Less Transparent And Vivid
than the preceding variety, which is preferable in unmixed tints. For compound hues, French blue is sufficiently well adapted, and is extremely useful. With aureolin and burnt Sienna, or Vandyke brown, it affords valuable autumn greens; and with lamp ... Or French Veronese Green Is A Comparatively Recent Introduction
similar in colour and general properties to the following; beside which, however, it appears dull, muddy, and impure. It is often adulterated with arsenic to an enormous extent, which interferes with its transparency, mars its beauty, and renders it o... Or Green Earth Is A Sober Bluish Green With A Grey Cast It Is A
species of ochre, containing silica, oxide of iron, magnesia, potash, and water. Not bright and of little power, it is a very durable pigment, being unaffected by strong light or impure air, and combining with other colours without injury. It has not ...