Dictionarium polygraphicum. Orange colour.

Dictionarium Polygraphicum:
Or, The Whole Body of Arts Regularly Digested.
Vol II.
London: Printed for C. Hitch and C. Davis in Pater-noster Row, and S. Austen in St. Paul's Church Yard. MDCCXXXV.
1735
An orange-colour for washing prints is made by laying on a teint of Gamboge, and over that some minium or red-lead wash'd and rendred fine and fit for use; it not being fine enough to paint with, as it is bought at the shops; and besides, it will change or turn black, after a few weeks, if it be not refin'd; but if it be well prepar'd, will be very lasting and beautiful.

But this you may take notice of, that an ounce will not produce above 20 grains os a good colour, to stand the test of painters.

This colour may be mix'd with gamboge, upon a white Dutch tile, to render it of the teint you would have it, either softer or stronger; or the gamboge may be glaid over and strengthened with the tincture of saffron, which, will make it glare into a strong orange. See MINIUM.

Some may think it strange, that as for orange colours I mention those deep sorts tending to purples: but I mention them as shades; and without which, the orange or red could not appear with any brightness.