Black also containes E102 (along with E123 and E133)
O/T: E123... 'but since 1976 it has been banned in the United States by the Food and Drug Administration (FDA) as it is a suspected carcinogen. The FDA showed a significant increase in cancer among aged female rats that had been fed large doses of the dye.'
...err why do we still have it in Australia? Also listed as 'forbidden' and known to cause disease beyond any doubt on the E number page on wiki.
edit: Back to the green food colouring, E102 is listed first, and 'total dye stuffs' is 2.1%, so I figure it should contain the majority of that 2.1%, so >1.05%... so ~0.5ml per ft square perhaps?
I wonder if they do work, will it stay green? or use only the tartarzine part and be yellow? Hmm.