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What if my Crystal Pepsi is just pepsi mixed with crystals or pepsi made into a crystal? Then it's an accurate description of the product?

Pepsi does not want you corrupting their brand by mixing it with Something-Else and calling it Something-Else-Pepsi.

Accurate description is not at all what the legal issue is about.

Trademarks indicate provenance, they don't describe product characteristics.

the provenance is that it's pepsi mixed with crystals therefore crystal pepsi

just like pepsi bottle crate is a crate for bottles of pepsi