FWIW, every "recommended" mug in her current list is a glass mug, not a ceramic glaze mug. Which is no problem for me but this doesn't answer the original ques

FWIW, every "recommended" mug in her current list is a glass mug, not a ceramic glaze mug. Which is no problem for me but this doesn't answer the original question. As a matter of fact, I ordered a new glass mug set from Amazon using a link in her article (which I assume is an affiliate link) out of gratitude for her work.