Here are some unscientific tests between the Aquazol binder that's used in QoR watercolour and gum arabic used by many other brands. Aquazol (Poly(2-ethyl-w-oxazoline) was first patented in 1977 by Dow® Chemical. It's a watersoluble polymer designed as a substitute to gum arabic. Aquazol is said to be able to hold more pigment than gum arabic. Based on the swatches above, the
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