It would be great to have a semi transparent plastic that changed color in contact with botulism. You could then make milk cartons out of the material (or milk cap inserts) and applejuice or milk would be able to show a Mr. Yuck if there was a problem with the contents.
-- bigattichouse, Jul 06 2005

Not botulism specific Smart_20Food_20Containers
...but otherwise the same idea. [DrCurry, Jul 06 2005]

random, halfbakery