I just caution all to use CD4 for C41, CD3 for E6 and RA processes. Make sure you use a proper final rinse. And try to avoid a blix for films. Also, ALL color film developers, including the E6 first developer contain Iodide to prevent runaway crosstalk. In addition, E6 uses Hydroquinone Monosulfonate instead of HQ. I know, I know, HQ can be made to work, but it is too active for proper color, grain and sharpness when direct comparisons are made.
Best of luck.