i know this topic has been talked about exhaustively. (i'm ducking as i type this). i have read thru tons of threads on past questions on the topic food safe glazes. so greatful i found this site and all of it's info. after reading numerous threads and thoughts and opinions i have decided to get my commercial glazes tested at brandywine.....just can't figure out WHAT to get tested since i use lead and cadmium free glazes.
i use 4 standard commercial glazes. i bought my TNF kiln brand new and have never used glazes with lead or cadmium. i fire consistently the same. i contacted the manufacturers today to figure out WHAT i should test for and can't seem to get a good answer. they are protective of their recipes (which i understand) but i am having a hard time getting some direction on what might be in their glaze that i should get tested.
wanted to see if anyone is familiar with these following commercial glazes and what your thoughts are on WHAT i should have tested. i read one thread of a savvy potter who KNEW there was lead in a glaze (manufacturer kept saying there was no lead in it) he bought but it took several calls to get someone at the manufacturer who actually KNEW there were trace amounts of lead in it.
so does it make sense to just have the labs test for lead on each piece? is there any logic to that? these are the following i use:
coyote cone 6 blue oasis-was going to have them test for copper leaching
coyote cone 6 cobalt blue-was going to have them test for cobalt
coyote cone 6 shino--no clue what to have them test for. hoping someone else uses this glaze and can give me some direction.
coyote cone 6 black--no clue what i should test for. waiting for manufacturer to get back to me. (i use this to layer under shino...looks awesome but not sure if it would be food safe. one site says once you start layering glazes "all bets are off.") so i was going to send a layered piece in for testing but same question--what do i have them test for?
amaco cone 5/6 tourmaline--no clue what i should test for. have traded emails back and forth but can't get any ingredient in this that i SHOULD test for.
again---just trying to be responsible. don't want to blindly trust the manufacturer since i am the one making the product. plus i like the idea of having documentation saying that i have taken that extra step.
any thoughts to those who have had commercial glazes tested? i tend to think way too much and make things much harder than they need to be---did you just have them test for cadmium and lead leaching since those are the only ones regulated by the FDA? is there any point to having any of these tested for cadmium since i don't use reds? or did you have any other specific ones tested for leaching?
OR any questions specifically i should ask the manufacturer since they are pretty careful about what they say is in these glazes?
eventually i will maybe start mixing my own glazes...i am nowhere near that stage right now. hoping to stick with these 5 commercial glazes while i concentrate on form and body of my pieces.
if you are still reading--much appreciated.
trying to figure out the most logical way to go about this.