The flask reminds me of a 600 mL beaker that I broke while washing. The whole bottom just fell out, leaving me with a hollow glass "tube." Nearly cut
myself with the sharp edges.
EDIT: That was off-topic. To OP, its probably iron, maybe a bit of nickel and chromium if you used stainless steel. Graphite is a good option, or you
would go with something less reactive, maybe copper if you can get a copper crucible.
[Edited on 2-23-2018 by ninhydric1]
The philosophy of one century is the common sense of the next.
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