The only way I can tell them apart is the intensity of glow when it's in the flame.
Boro gets a lot closer to white hot than the yellow I get from softer soda glass.
Oh and don't forget that you WILL need welders shade 5 or 6 to work with boro.
A lot of the pipe makers use boro and they often actually get sunburns on their fore arms and face when they work with boro all day.
The safety of your eyes is, like, REALLY important here.
You know how ants turn into smoke when a magnifier focuses the sun on them?
Boro WILL do something very much like that to the back of your eyes in about 20 seconds and leave you with a blind spot right at the center of your vision.
Sun glasses will NOT prevent this and didymium only work effectively with soft glass.
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The Zombie Apocalypse is Upon Us.
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