Let's talk about "Food Safe"

First I'd like to say do your own research on the matter of "food safe" here are the two links that pertain to glaze food safety. https://www.fda.gov/media/71762/download https://www.fda.gov/media/71764/download 

What does "Food safe" mean for glazes in the USA ?

First lets understand the term "Leaching" 

Leaching: When an acidic liquid sits in a vessel. It can have the tendencies to pull particles from the glaze into the liquid. Then if the liquid is consumed you are injesting the leached particles.

According to the FDA guide lines your glaze for Cadmium is

Flatware Average of 6 units 0.5 micrograms/ml

Small Hollowware any one of 6 units 0.5 micrograms/ml

Large Hollowware any one of 6 units 0.25 micrograms/ml

According to the FDA guide lines your glaze for Lead is

Flatware average of 6 units 3.0 micrograms/ml

Small Hollowware other than cups and mugs any one of 6 units 2.0 micrograms/ml

Cups/mugs any one of 6 units 0.5 micrograms/ml

Large Hollowware other than pitchers any one of 6 units 1.0 micrograms/ml

Pitchers any one of 6 units 0.5 micrograms/ml