I tried three but plumped with Turmeric for yellow and fresh beetroot for red as both taste nice, have medicinal qualities and have memories attached. I followed the same recipe as for blue.
Then ate the left overs for lunch .
The mix died quickly and can be used thinly or thickly to adjust the opacity.
A few more to try I’ve hit my drawing supplies now.
Should produce white and black.
Sarah Chalkie Cloonan 