Ive had the same problem with black tempera paint!! One day I had a
bottle fall from the shelf!!! When I looked at it the bottom was rounded
and it looked like it was going to explode!!!! I pick up anouther not so
puffed bottle and opened it and boy did it stink!! so I put it all in a
trash bag and took it to the secretaries to send back to the warehouse.
Now that I think of it, I bet they werent to happy with me!