Just a bit of info on Cibachrome chemistry…from my 30 years of running a Ciba lab. The toxic question seems to come from the sulfuric acid bleach bath, but as such it's not considered a toxic chemical. Dangerous, maybe, as the numerous holes in my clothes from those years testified. It is was always neutralized with baking soda before disposal.
The dyes used in this dye-bleach process were in the paper and very little got bleached out and thus into the waste stream. Those toxic dyes were much more of an issue with all other common color printing methods, where they were present in the developer which could end up down the drain.
All things considered, from an environmental view as well as overall print quality, we are much better off these days with modern pigment inkjet printing. I don't miss the darkroom at all.
The paper/chemicals for such a process used to be known as Cibachrome, later Ilfochrome, if I am not mistaken. Both are out of production now, mostly due to environmental concerns (toxic). I am not aware of any other process that replaced it. When printers knew what they are doing, the resulting printouts were gorgeous (Michael Fatali comes to mind). However, there was a strong buildup in contrast, so often contrast masks were necessary to tame it.
I strongly believe that scanned transparencies and digital post-processing offer more control and similar end results, with much less hassle today.