If 19th century workers needed to be working in an environment much like the inside an active volcano for several hours, would they have materials to make a proximity suit to do this? Assuming working in air at temperatures of 900°F for 4 hours, and the time is 1890. Assume they have chemical oxygen candles (rebreathers) as well. Their job is maintaining airships on a very hot alien planet
Note: Proximity means “near the hazard.” No one is swimming in magma.