Hello dear members of FPN, I would like to know whether there are any ways to identify when the particular bottle of J Herbin has been manufactured. Also is there a shelf life to their inks (non-shimmer one, I am looking at Poussiere De Lune with interest). This is assuming that the ink itself was not sun-bathing on a window display or the bottle otherwise tampered with. I am also looking at PR Ebony Purple, but am wary of catching a bad sample, now that their inks are manufactured after the passing of the original owner (who presumably knew the secret sauce to make these colors tick). Read enough to know that I may also get one sample with slime/sludge/mold etc. Thanks in anticipation,