[Nursie]

Is that still the law?

Also, it may not be considered an ingredient so much as a tool or technique...

[tobltobs]

It isn't a law anymore. But I do not know one beer brewery which doesn't still brew according to it. However, the food industry is usually quite creative in bending the rules...

[Nursie]

From a quick googling - it looks like finings were allowed, as they aren't strictly an ingredient.