They are finger tip size small balls of volcanic exploding and creating a bed of 'gravel'. Some float due to trapped air and some are filled. Black green glass.
Mart> >> The other - broken pyrex glass. That is high temp glass
That's just 2 % sulfur:
Look for flowers of sulphur.
Flowers of sulfur. Ask the pharmacist to order you a lb if they don't have it. It didn't used to be very expensive. Charles is right about the garden shop source too, probably cheaper but you might have to buy more than you want. Karl
Looks like one can buy sulfur from online pyrotechnic suppliers for very reasonable prices ($5-$10/lb). I assume it's not very pure compared to reagent grade chemicals.
Eg (no knowledge of this particular supplier)
Spehro Pefhany fired this volley in news: snipped-for-privacy@4ax.com:
Purity for this application is not an issue.
Many pyrotechnicians use 95% wettable dusting sulfur from the ag suppliers. It runs in the range of $1.00/lb, and works fine for all but the most contamination-sensitive formulae.
LLoyd
You might as well just call Homeland Security and beg to be placed on the 'no fly' list while you're at it. :-(
I thought pyro chemicals only rated the anal probe before flying list.
Add some soda and lime, which depresses the melting point of silica.
Phil Hobbs
You really don't want to deal with lava at home.
Phil Hobbs
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