We found an efficient method to extract pigments from plants. Just after the filtration, when the pigments were still wet, we use them and paint with a brush. But after are dried and milled, its no longer possible to dissolve them again in water or other solvent (MeOH, EtOH, CH2Cl2, hexan), we obtain only aggregates. Does anyone know how we dissolve them again in water with arabic gum ? Thank you in advance.
Thank you for your answer and your help. Some plants where the pigments were extracted can be seen at http://orbi.ulg.ac.be/handle/2268/159078 . Concerning the method I will contact you by the mailbox as is not published yet.
To use madder dried extracts, I've put them in water again and leave them to ferment for a few days with a little vinegar to start it.
After that, I let it settle, get the water out, filter, and let it dry again.
Il will then be usable for different purposes.
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