Confusing naming indeed. More confusing than the usual question of the degree of water of crystallization in compounds like sodium carbonate where at least if it's labeled correctly we get only one version, e.g. monohydrate, decahydrate etc.
Originally Posted by Rudeofus
So confusing, in fact, that www.borax.com have made a mistake in their product data sheet for the 4-mol. See page two, top right, where 4H2O should read 2H2O.
I wonder which version my sodium metaborate is (bought at Vanbar Melbourne). It didn't matter much with PMK because Part_B was pretty much a saturated solution and some people varied the relative amounts of Part_A and Part_B anyway. But in this interesting concentrated Xtol-like developer I would guess that the pH would be sensitive to errors in the exact amount of metaborate.