Originally Posted by sevo
Ask the disposal company you work with.
They don't know.
They are not used anymore to work with photo chemicals.
But at least, giving it to them, I don't have to throw the chemicals into the public sewage, which isn't nice.
I usually mix stop and fixer in the same bottle, in small quantities. Sometimes developer and fixer. Having a bottle per chemical is bulky and not very comfortable. Specially with C41 and RA4. Too many bottles.
I just never mix stop with developer.
I read the manuals thoroughly, but haven't find any info about this. Knowing which chemicals can be mixed together would be of great help, for many people, I suppose, and probably preventing some from just pouring them down the drain.