Coca leaves contain a range of chemical compounds ... but the addition of calcium-rich substances - which draw out far more of the alkaloids - was seen to be a much more recent development.

For collectors of advertising art, Coke is it. From the beginnings ... Robinson (based on the two main ingredients -- the South American coca leaf and the African cola nut), who also drew the ...

Coca leaves contain a range of chemical compounds ... but the addition of calcium-rich substances - which draw out far more of the alkaloids - was seen to be a much more recent development.