It is perfectly acceptable to use the plural of non-count nouns when discussing multiple different types of something.

Here are some examples, using milks:

Daily tests of the butterfat contents of the three milks showed much wider variations ...

 

The season's results of the casein analysis of the three milks are shown ...

Fish and fishes is another example that comes to mind.

It is perfectly acceptable to use the plural of non-count nouns when discussing multiple different types of something.

Here are some examples, using milks:

Daily tests of the butterfat contents of the three milks showed much wider variations ...

The season's results of the casein analysis of the three milks are shown ...

Fish and fishes is another example that comes to mind.

It is perfectly acceptable to use the plural of non-count nouns when discussing multiple different types of something.

Here is are some example usages of milks:

Daily tests of the butterfat contents of the three milks showed much wider variations ...

The season's results of the casein analysis of the three milks are shown ...

Fish and fishes is another example that comes to mind.

It is perfectly acceptable to use the plural of non-count nouns when discussing multiple different types of something.

Here are some examples, using milks:

Daily tests of the butterfat contents of the three milks showed much wider variations ...

The season's results of the casein analysis of the three milks are shown ...

Fish and fishes is another example that comes to mind.