Originally Posted by lilserenity
I currently use the Cibachrome tanks for black and white RC, but they are/were designed for daylight processing of colour materials that require that the paper be in absolute darkness, so they should be well suited for RA4 materials.
You should of course check that there are no cracks and no other signs of physical damage that might cause light to leak.
I'm not sure whether it is a good idea to do smaller prints in the larger tanks - I generally use my 8x10 tanks for 8x10 prints. An 8x10 in a 11x14 tank might not stay in place.
You will need to fine tune the volume of chemistry you use - for black and white chemistry I find that about 100ml gives me even results, as long as there is enough capacity in the chemical itself.