Hi guys, I've been recently given 1kg of metol. It was in an old tin box which seemed to have never been opened. Upon inspection, I noticed that it doesn't look like the metol I had just bought a couple of weeks ago. That looked like white crystals, while this one is noticeably finer (like flour) and slightly pink. It looks as homogenous as it gets, I mean it's not like parts of it have become pink. It all looks the same. I know, because I transferred the entire contents of the box to another jar (I couldn't help it - I'm a fan of those brown glass jars and bottles). Nothing about its appearance would worry me if I didn't happen to have another batch of metol to compare it with. Is this pink shade normal? Or does it mean that it's dead? Thanks.