I use a 1:2 mol ratio of choline chloride: urea. I heat the mixture for 30 minutes at 80 deg C until a clear liquid forms. Cool to room temperature before use.
I place a few drops of dye ( yellow food coloring is shown here) in 2 ml. of the DES. I then add 1-2 ml of boiled linseed oil and stir well.
It seems the linseed oil is forming a micro-dispersion in the DES/dye. it applies beautifully to poster-board or wood. It will dry over 30 minutes to the touch. No odor. The DES/linseed oil will not change over 2-3 days at 20 deg in an open beaker.
Copyright 6-19-23. David S. Soriano
I am a chemistry professor and studying this formulation in the lab .
Please acknowledge my website if you try this paint.