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Of course, when working with stuff that was quite brown in its raw state, a brighter color would be the most preferred. The best red of Pompeii was a vermilion made from the cinnabar mineral. We've come to associate the word cinnabar with fine Asian objets d'art like the box below, in the Victoria & Albert Museum.
|photo by R. Weller/Cochise College | collections.vam.ac.uk|
I bought two quarts of Cochineal and began painting over the original red. To my great dismay, the darker red would not cover the brighter red! I went to Sherwin Williams (I am not remunerated for mentioning the brand), and the employees there informed me that I would need to cover the original red with a gray primer, and then paint at least three coats of the Cochineal red.