I've heard that clay bodies with a lot of iron are not suitable for raku and will even blow up. I've also read that for pit-firing, "get a clay suitable for raku firings. The best color results can be achieved with iron bearing, or red clays" which implies that red clays are suitable for raku.
Do you or anyone following the clay club blog have experience with raku firing of iron rich clay bodies?
I'd appreciate learning from anyone's success or mistakes.