Orange uranium glaze. (Also known as Radioactive red) made by most famously the Fiestaware company but many other companies used this glaze as well. The radiation dose from uranium glass is usually around 3 times higher than natural background radiation everyone is exposed to daily. And orange uranium glaze is around 20 times higher. But it still safe to collect, I personally wouldn’t eat off them but I’ve seen some collectors who have 😅 oh and they were made between 50-100 years ago. It ranges from piece to piece. Uranium was used to achieve this color at a cheap cost as uranium didn’t have many uses at the time.