Velazquez: The Technique of Genius.(Review): An article from: Renaissance Quarterly (BHCV98), BHCV98, Suzanne L. Stratton-pruitt at camelcamelcamel: Amazon price tracker, Amazon price history charts, price watches, and price drop alerts. Velazquez modulates the color of the sky by mixing azurite with iron oxide, lead-tin yellow, lead white, calcite, and large amounts of oil. When he wanted to increase the fluidity of the paint, he increased the proportion of calcite and oil. Velázquez - The Technique of Genius. Delivery & returns. This item will be dispatched to UK addresses via second class post within 14 working days of receipt of your order. Standard UK delivery is £ per order, so you're only charged once no matter how many items you have in your basket. Any additional courier charges will be applied at.