2016 Buckthorn with vinegar paint results

Here are the paint results from these buckthorn and vinegar recipes in 2016.

 

I was able to make a nice sap green from the buckthorn with white wine vinegar by adding a little potassium aluminum sulfate (alum).

Note that the 25% acidic vinegar and buckthorn produced a thick juice that required more thinning and would require more water and more gum Arabic to produce a smooth paint.

When I added alum to both buckthorn and vinegar recipe it resulted in green!  By itself, the results were less satisfying and not what I would call green but more blue gray.

Side note: I think the shininess on the first two swatches is the result of a little too much gum Arabic.