I have a two part question, the second depending on the answer of the first. I don't know if that is frowned upon, but I'm not sure how else to ask.
Foil is an uncountable noun so it is not pluralized, but is it correct to use the plural when referring to several kinds of foils? Just like fish is plural but some people refer to several species of fish as fishes?
That company makes aluminum foils
Meaning, they make many kinds of foils out of aluminum
If this is OK, then why is
"organic and inorganic matters"
"organic and inorganic matter"
There are several kinds of matter being referred to. It seems to be following the same rule.