Food Safe Glass
No, not all glass is food safe. There are many types of glass used for many purposes, each with it’s own characteristics.
Glass Food Steamers
A question came to me this week regarding a glass steamer I had suggested back in 2013. At the time it was the only glass steamer I could find and it was only available in Canada. More recently, I could only find one glass option that didn’t have an other materials of concern.
Lead in Glass Canning Jars
I use glass canning jars with glass lids for almost all of my food storage---I don't actually can with them but I store lots of different foods in the fridge, pantry and freezer with them. I came across a blogger who used an XRF gun to test these jars and found they had 142 ppm of lead. I called the company and when I asked if the jars were lead-free, they said that no glass is lead-free. They said their jars were tested annually, and that they were made in Germany where they said the standards are stricter, and they said that it would be impossible for lead to migrate into the food.
1950’s Fire King Milk Glass Dishware - Is it Lead Free?
I've always liked milkglass, and saw some on Etsy from the 1950's (I think, given the stamp and what google says about the date stamp).
From all what I can learn through google, there was arscenic in milk glass back in the 1800's, and then they stopped that and used lead for awhile instead to acheive the same milky look, up to the early 1900's.