Sorry Luxus but I simply don't believe you. You'll have to provide a link as noted above for the chemical change
About Green
As with blue, the Ancient Egyptians could also manufacture a green pigment – verdigris (Ancient Egyptian name 'hes-byah' – which actually
means copper or bronze dross (rust). Unfortunately, verdigris reacts with sulphides, such as the yellow pigment orpiment, and turns black. (Mediaeval
artists would use a special glaze over the top of verdigris to protect it.)
So this confirms the colour green and black for Osiris
About blue
Blue (Ancient Egyptian name 'irtyu') was the color of the heavens, the dominion of the gods, as well as the color of water, the yearly inundation,
and the primeval flood. Although Ancient Egyptians favored semi-precious stones such as azurite (Ancient Egyptian name 'tefer') and lapis lazuli
(Ancient Egyptian name 'khesbedj', imported at great cost across the Sinai Desert) for jewelery and inlay, technology was advanced enough to produce
the world's first synthetic pigment, known since medieval times as Egyptian blue. Depending on the degree to which the pigment Egyptian blue was
ground, the color could vary from a rich, dark blue (coarse) to a pale, ethereal blue (very fine).
You may be thinking of Turquoise
Colours of ancient Egypt
Your link also doesn't work to 'The Mythical Origin of the Egyptian Temple', I think you will find it doesn't quite say what you want it to
say
edit on 27/11/12 by Hanslune because: (no reason given)