(05-11-2019, 03:58 PM)Koen G wrote: You are not allowed to view links. Register or Login to view.Your last article looks interesting. However, the ink they tested is carbon based (Egyptians used a burning process to make ink, resulting in a carbon called "lamp black"). European ink like the one used for the VM rely on oxidizing iron particles for their blackness. Therefore I suspect this method could not be applied to the VM.
The iron-gall ink is made from iron and tannic acid from vegetable sources. The acid certainly has carbon in its chemical formula.
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Organic material in the green paint contains carbon as well.