I'd say "no" to dyeing the rodents too. I have NO idea what's in squid ink that might impact (be harmful) to snakes, & food coloring isn't always harmless either- and especially not in the amounts you'd be feeding to a snake, whose body may be far less tolerant than ours, in part simply because they're far smaller than we are too.
Remember that while ingesting a tiny amount of food color by a human may not cause obvious harm, it might be something that a snake's body can't handle at all. You cannot assume safety for reptiles at all. There are plenty of ordinary foods that we can eat that some animals cannot, & vice versa, so I'd stick with ONLY what's natural for a snake to eat.
Dogs, for example, can get sick (& even die!) from eating chocolate, avocados, grapes, raisins, coffee/tea, xylitol (artificial sweetener), salt, yeast dough, or alcohol. Keep in mind that sometimes substances built up in an animal's body that they cannot process or eliminate- that's what happens with chocolate for dogs- it may not prove fatal right away, but it accumulates until it does. I would expect similar issues for snakes, but not with the same things- & no telling which ones. And there's virtually no research to see what things are safe for them- so please don't try it.
https://pubmed.ncbi.nlm.nih.gov/23026007/
I would check with other suppliers for a source of dark rodents.
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