Please, what's the matter with starch? (Or as I recall the formula was
for dextrine.) Why the "alternative"?
Also, many years ago I bought a Johns-Manville (pre-bankruptcy) product
called "Celite," a Diatomite Functional Filler, which came in various
grades & was very inexpensive, for use as a flatting agent. The label
notes that among other functions it is "a delicate abrasive", etc. etc. It
worked fine. I didn't get silicosis (yet).
But as I say, why not dextrine?
Judy