anilinas de colores

16:17 May 10, 2014 

We are not going to be arrested for trying to poison the kids:

"Water-soluble dyes are your first choice—The
most commonly available dyes are powders dissolved
in water. often termed aniline dyes (although no longer
made from this product), water-soluble dyes provide
great flexibility in how they can be mixed and also how
they can be used. " https://www.finewoodworking.com/FWNPDFfree/011190044.pdf

So you could use the original "aniline dyes", although I would prefer not to perpeturate the word personally.

15:50 May 10, 2014 

... based on Noni's links (thank you!) and on the fact that it has to be wet, that is, a liquid. Coloured dyes?

15:47 May 10, 2014 

The idea is that you sprinkle salt on the "anilias de colores" while they're still wet and the colour seems to accumulate or get stronger where the salt is. Dyes??

14:37 May 10, 2014 

Aniline pencils gets some hits, but they're all pre-1940s. Aniline crayons gets none to speak of. And yes, aniline dyes are highly toxic.
You could just write it off as one of life's mysteries and substitute something like food colouring or non-toxic dye.

14:17 May 10, 2014 

I think it may be dyes after all, rather than acaja's coloured pencils. I'd be surprised if it were the latter, since I've spent 28 years in Spain working closely with kids and don't recall ever coming across the term. Ready to be proved wrong of course!

Perhaps Mary's text tells us about some kind of process as well as the materials? Do you dye the sand?