A Treatise on Painting, by Leonardo da Vinci
1721
Senex and Taylor, London
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You must always provide a very White Ground for Colours which you desire to appear bright, provided they be transparent; for others a White Ground is by no means suitable; as is found by Experience, in Painted Glass, the Colours of which appear extremely beautiful, when held between the Eye and the Light, but lose all their Lustre when held to a thick dark Air, or an Opake Body.
