Food dyes

In my day job we use soluble food dyes for experiments on e.g. transpiration, the way that plants take up water from the soil.

Waitrose and Tesco no longer seem to stock the food dyes (Langdales) we usually use for these experiments – they’ve replaced them with Dr. Oetker dyes that doesn’t seem to work at all, because they're a suspension of insoluble natural colourings; they're presumably OK for cooking, but they're pretty much useless for this experiment.

Can anyone suggest alternatives, preferably in several colours? Or point me at a source for the Langdale colours or something like them? We need something non-toxic (which hopefully applies to all food dyes), at least two or three colours - it would be useful to have red, blue, green and yellow - and non-toxic to plants, which rules out some of the chemicals I might otherwise use. Someone has suggested dyes used by soap makers, any other ideas?

Another weird Sector General thought...

What if the educator tapes used in the Sector General books to give physicians the knowledge of alien doctors were derived from Dollhouse technology? Could get VERY creepy. I have a horrible feeling I may actually want to write this as fanfic...

later - oh dear lord, I think that there may be comedic possibilities...

Eliminating redundant redundancies

Police Code has the entry "Cock and Dog Fighting" which has several "see" references including "see Ferocious Dogs" - which is an entry that reads, in its entirety, "Ferocious Dogs - See Dogs"

I'm converting these references into hypertext links. Should I make the link from "Cock and Dog Fighting" lead to "Ferocious Dogs" or go straight to "Dogs?"

later leaving it - as others have pointed it out, it's of historical interest.

I've updated the online files, now have clickable links on all (I hope) entries A to C and quite a lot of the later ones.