\paperw4260 \margr0\margl0 \plain \pard\tx150\tx870\tx1590\tx2310\tx3030\tx3750\tx4470\tx5190\tx5910\tx6630\ATXts240\qj\ATXbrdr0 \f1 \fs24 Hence colors such as red and
yellow are made up of iron oxide, more or less hydrates; greens from green ground (iron silicate) or malachite(copper basic carbonate), blues from the stone lapislazzuli (alluminium silicate and potassium with sulphur) or azzurrite (copper basic carbonat
e), white from carbonate chalk called "St. John's white.ö \par
\pard\ATXts240\qj\ATXbrdr0 These hues penetrated inside the plaster because applied freshly, that is they entered and became part of the intonaco and were not put just on top of it.
