I have 15 liters of unused Agfa BL-70 ( is same as C-41 bleach) which I have no use for. Does anyone know how I can dilute this to become RA-4 bleach ?
If you use it at it's C41 dilution it should work fine. You can dilute it a little more if you want to conserve or instead use it more before you dump it. You'll probably have to use a separate fix as well, so it will be more complicated than using the Kodak blix and take longer.