eemilyy

Not entirely uncommon to fully fire commercial wares to get rid of any failures then lowfire glaze the survivors.. Many lowfire glazes have tested as or more durable than high fire. As long as you can spray apply or just apply the glaze evenly, these could be super nice plates when finished.

That was interesting about the Syracuse china.  Maybe you could try one plate, with cone 5/6 glaze, place cookies or wasters under it, and just see what happens?   
I have a few pieces of Duncan bisqueware that I was going to do that with.  But when I looked it up, that bisque ware is low fire.  I don't have any low fire glazes,  so they are still sitting in a box.  
Could be a fun experiment?
Roberta