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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
... Proportions Of Thirteen Purple To Three Yellow Measured In Surface
or intensity. Being nearest to the neutral white in the natural scale of colours, yellow accords with it in conjunction; while, of all colours, except white, it contrasts black most powerfully. Yellow is discordant when standing alone with orange, uns... Purple Being A Secondary Colour Composed Of Blue And Red It
follows of course that any blue and red pigments, which are not chemically at variance, may be employed in producing mixed purples of any required hue, either by compounding or grinding them together ready for use, or by combining them in the various ... Quoque
TTITLE PRIMARY BLUE ... Recommended For Painting If Not Too Thinly Applied
... Red And Blue In The Proportions Of Five Of The Former To Eight Of
the latter; proportions which constitute a perfect purple, or one of such a hue as will neutralize and best contrast a perfect yellow, in the ratio of thirteen to three, either of surface or intensity. When mixed ... Red Indian Ochre Scarlet Ochre Carnagione Terra Puzzoli
... Red Is The Archeus Or Principal Colour In The Tertiary Russet; Enters
... Red On The One Hand And Of The Middle Tertiary Russet On The
other; while, unlike the other secondaries, all its hues, whether tending to blue or yellow, are of the same denomination. These attributes of green, which render it so universally effective in contrasting colours, cause it also to become the least ... Requires Its Contrast Orange In Equal Proportion Whether Of Surface
or intensity, to compensate or resolve its dissonances and correct its coldness. In nature, however, blue is not discordant with either green or purple, nor are any two colours (as we have said before) ever found ... Root Of The Anchusa Tinctoria Commonly Known As Alkanet A Plant
growing in the Levant, and some other warm countries. It was used by the ancients as a dye, or as a groundwork to those stuffs which were to be dyed purplish-red: the ladies in ancient times also employed it as a ...