You're welcome Enzie.
I probably shouldn't have used the term "spoil" since what it does is more like deteriorate when left in solution too long. I usually mix up about a pint at a time and use it within a few months. The dry flakes last indefintely as far as I know.
I imagine the Constables I saw were sized with gelatin. Many areas of the paper were left unpainted, but the paper was a bright white.
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