Here’s a tube of Blockx that’s gone bad. Phtalo green is so strong it overpowers other colors so I don’t use it often, but even so this tube should still be usable. I have other tubes that are much older.
As you can see, this tube of phtalo green has become so firm that it can no longer be used–it’s like plastic. Most of you probably know that as one of the leading manufacturers, Blockx paints are among the most expensive. Disappointing to say the least.