Polycitrate ester prepared thermally ( no acid catalyst in order to avoid yellowing) in a convection oven at 175 deg. C for 20 minutes to the point of a non-tacky glass-like polymer.
It is dissolved in warm water and added to finely -ground sidewalk chalks. Some PEG-8000 is added and stirred to creamy consistency.
Some of the higher molecular weight polymer ( heated to the point of water insolubility) will be studied as a reflective additive later.