Paint & Colour Mixing / A practical handbook for painters, decorators and all who have to mix colours, containing 72 samples of paint of various colours, including the principal graining grounds

by Arthur Seymour Jennings

Sky Blue.

—One part of Prussian blue added to one hundred and twenty parts of white lead give a sky blue, but some prefer cobalt, and this is for many purposes doubtless the best. Still another method of obtaining sky blue is to tint white lead with a little lime blue, adding a very little middle chrome, but the latter is more suitable for a distemper colour than it is an oil paint, as lime blue is not very lasting in oil.