Looking for my spare thermometer, i came across a forgotten 'new' (as in: unopened) bottle of T-Max developer today. It says on the bottle that the concentrate will keep for 2 years, but apart from a lot number, no date. The lot number is 00 02140 The leading "00" probably indicates the year 2000. Would that be correct? And if so, does anyone know what will happen if i use it anyway?