Whittock, Nathaniel: The Oxford Drawing Book, Or The Art Of Drawing, And The Theory And Practice Of Perspective: In A Series Of Letters Containing Progressive Information On Sketching, Drawing, And Colouring Landscape Scenery, Animals, And The Human Figure: With A New Method Of Practical Perspective: Detailed In A Novel, Easy, And Perspicuous Style, For The Use Of Teachers, Or For Self-Instruction. Embellished With Upwards Of One Hundred And Fifty Lithographic Drawings, From Real Views, Taken Expressly For This Work (Oxford , London, 1825)

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for skies.—12. Prussian blue is a clear bright colour useful for skies and water, in
fact in all cases where blue is required.
I have now enumerated all the colours requisite for a learner; but as I am on this
subject I will add a few others which you may afterwards find useful, and with the
names and qualities of which it is proper that you should be acquainted.
No. 13. Plate XCIX. Ultramarine is the finest and most beautiful blue that can
be produced, and is a preparation of calcined lapis lazuli. This colour is too ex-
pensive to be introduced into a box of colours for a learner, as a very small cake
amounts to a guinea; nor is this much to be regretted, as it is very difficult to use,
and is not easily levigated on the palette. It is chiefly used by miniature and
enamel painters, and is to them a most invaluable colour, as it will stand well, retain-
ing its brilliancy for centuries.—14. Carmine is a very bright rose colour more bril-
liant than lake : this colour is expensive and is chiefly used in fruit and flower pieces.
—15. Gallstone is a bright yellow, in my opinion not much superior to gamboge,
but more expensive. The great disadvantage of this colour is its liability to fade; it
is very transparent, and is sometimes used to lay over greens, which, having too cold
a tone of colour, require warmth.—16. Yellow Lake is expensive and not durable.