chrome alum definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
an alum of which one of the components is chromium; esp., potassium chromium sulfate, KCr(SO)·12HO, used in tanning and dyeing
chrome alum definition by American Heritage Dictionary
A violet-red crystalline compound, CrK(SO4)2·12H2O, used in tanning, as a mordant, and in photography.