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I like both abrasives very much.

Chromium Oxide has the Kremer Pigments #44200. Iron Oxide has the Kremer Pigments #48100.

Here are the links to the abrasives I use...

Chrome Oxide Green...

I have personally used their 0.1 micron (actually, 0.09) micron iron oxide for the same length of time - 4 years. I use 0.3 micron on balsa, wipe the blade, then strop on 0.1 micron iron oxide on...

See my reply above about Kremer 0.3 micron chromium oxide powder. I have personally used the 0.3 micron chromium oxide from Kremer for about four years.

I don't know about the particle size of the other fillers other than the iron oxide. But, I am very satisfied with the 110 product iron oxide from Kremer. The same goes for the 0.3 micron Chromium...

Thanks for the information about FeOxide. At 0.1 micron, I didn't realize it was so fine! And, I will try it.

I am doing well with CrOxide as my last polish, (0.5 from SRDesigns and 0.3 from...

Olivia, have you used other Chromium Oxide sources other than Kremer? If so, how would you compare?

Will test, and will reply here. I have asked for more specific information about the % of larger particles, and will respond here also if I get more information.

I sent an inquiry about particle size to Kremer, and just got back a reply, which I will add below. They say "predominant size is 0.3 microns", and I gather it is very pure, meaning not many...

I ordered some of the Kremer Chromium Oxide mentioned above. Have not used it yet, and can't comment on performance. Ordering information from a US outlet...

Kremer Pigments
247 West 29th...