One thing that I will share from a wine bottle class...
She did not recommend adding 104 or 96 frit or stringer to recycled bottles. If I recall correctly, even if cracks aren't apparent immediately, you're subject to stress and it has the potential to fracture later. The bottles can wildly vary from high 80s to low 90s. You can try, but I wouldn't feel comfortable beyond non-coe additives.
A couple ladies have used frit however. Maybe they'll chime in and give their experiences.
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