Search:

they are Kremer pigments I got mine in Australia but I believe you may be able to get them cheaper direct from Kremer in Germany & possibly the US suppliers
Iron Oxide # 48100 is 0.1 micron
Chrome...

169959

So I finally got hold of some bees wax on Sunday morning so I thought I would give the Oxide crayons a try
after some googgling of how to make crayons & some additional info from the lads...