For the last several months I've been trying to locate sulfur in bulk so I can try out something called sulfur casting (lost-wax casting using liquid sulfur instead of molten metal). All I've been able to find is five pound bags of something called soil or garden sulfur at nurseries and home centers. It doesn't look like sulfur though, it's a weird tan-brown color that I don't really like how it looks, and don't want to waste a good one-time-use plaster form trying out. After opening the package and being disappointed I looked at the percentage of sulfur on the bag and it said 90%. I guess that other 10% is the stuff ruining the color from the bright yellow sulfur I've seen pictures of. Other than at a pharmacy--which would be way too expensive to get in bulk quantities (kilos) for casting. Plus I think I'd be paying for a level of purity I don't need (I don't need to be able to eat the stuff and not have it be bad for me, just cast with it.)--where might I be able to purchase purer (95%, 97%, 99% or whatever would look like sulfur should) sulfur? Thanks.