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That's what the hyphens are for, as putting it in quotes could mean something entirely different.
It should be written:
toxic-metal-free primers
The first three words are adjectives modifying the word primers.
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"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.
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