Jump to content
Sign in to follow this  
hershey8

Food Safe Glaze Database

Recommended Posts

hershey8    13

Is there a food safe glaze database somewhere on the internet? I seem to only find bits and pieces, here and there.  Is my search needless? By following certain rules and leaving out known toxic glaze ingredients, wouldn't most glazes then, be food safe?  Are there general recipes that we can add colorants to that are considered safe, even if they have minute amounts of toxic ingredients in them.  It seems like some  home brew glazes would be "safe" even without lab testing. Any thoughts on this appreciated.   ja

Share this post


Link to post
Share on other sites
atanzey    6

I think you're going to hear most everyone say that it's not quite that simple.  Glazes mixed by different people, and fired on different clays with different firing schedules may have different results.  Then when you want to vary the color in a base glaze, the colorent oxides have varying toxicities and have varying effects on the glaze stability.

 

That said, if you aquire the book 'Mastering Cone 6 Glazes' by Hesselberth & Roy, they have several base glazes that have been rigorously tested, and they consider very stable.  They do an excellent job explaining the complexity and justifying their conclusion.

 

If you do enough research, you'll get a good sense of what combinations and glaze types are more stabile, but the only way to be completely sure is to have laboratory tests performed.  The above referenced book also recommends a laboratory which performs the tests, assuming it's still accurate.

 

Alice

Share this post


Link to post
Share on other sites
hershey8    13

I think you're going to hear most everyone say that it's not quite that simple.  Glazes mixed by different people, and fired on different clays with different firing schedules may have different results.  Then when you want to vary the color in a base glaze, the colorent oxides have varying toxicities and have varying effects on the glaze stability.

 

That said, if you aquire the book 'Mastering Cone 6 Glazes' by Hesselberth & Roy, they have several base glazes that have been rigorously tested, and they consider very stable.  They do an excellent job explaining the complexity and justifying their conclusion.

 

If you do enough research, you'll get a good sense of what combinations and glaze types are more stabile, but the only way to be completely sure is to have laboratory tests performed.  The above referenced book also recommends a laboratory which performs the tests, assuming it's still accurate.

 

Alice

Thanks Alice, I'll look around and get that book! It sounds like it would be worth having.  I appreciate your response. ja

Share this post


Link to post
Share on other sites
JBaymore    1,432

Alice has it pretty much right. It is a very complicated subject.

 

To start with, there is no legal definition of "food safe glaze".

 

And legal responsibility (at least in the USA) for a product lies with the person producing it. Unless the manufacturer of even a commerial glaze specificaly mentions that it indemnifies the end user, THEY are not directly responsible in any way for any harm caused by the use of their product on YOUR wares. If you ever got into trouble..... you'd have to defend yourself. And then take legal action against THEM to recover your losses.

 

Luckily this is not a HUGE issue. Hence you can get a $2 million product liablity insurance policy as a potter for about $500 a year.

 

Best,

 

......................john

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×