You don't need a 4 bath to do colour. A Trimate 3 bath is all you want. slots for RA4 dev, stop and blix. then take the print elsewhere to be washed. Be aware if you use the same processor for B&W as RA4 it will become a real pain to have to keep draining the whole processor when you want to change over. The Stop and blix are pretty stable and will accept a little contamination but the RA4 developer certainly isn't and will have to be properly rinsed out when you need to swap over.
Then there is the weight. The three chemical baths can be drained in-situ, but the water jackets of a 12x16 which is what you will need for A4 prints contain approx 4 litres of water each. They are heavy to lift about (approx 16 pounds) and a regular movement can cause leaks to form internally - I know! It's happened to me. Internal leaks cannot be repaired easily and certainly not by the user
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