E6 processing; blacks are blue

[Bob2099]

I've been developing fujichrome r25n at home using a fujihunt 3 bath (1st developer, color developer, bleach-fix + stabilizer) E6 kit. I have noticed in the past when using depleted developers, the heavily underexposed areas on the film sometimes turn red (when the first is depleted) or green (depleted color developer).
The second to last time I developed a film, I had the underexposed areas turn blue. This was done with fresh chemicals and the next film I used the same batch of chemicals on, turned out the way it was supposed to, with black blacks.
I quite like the effect and would like to replicate it. Does anyone know what is causing this? I think the 1st developer or color developer might have been too hot, so it might be a temperature issue.
I'd love to hear from anyone who has experienced this, or anyone who might know more about it.

Thanks

[richard p. t.]

Hi Bob,
I tend to agree that it might be caused by too high a temp in the first developer.
cheers,
RT

[Bob2099]

Thanks Richard,
I'm going to experiment a bit with the temperature then.