Liquid for growing crystals

[ScotHill]

Our kids had a few crystal tree sets, where you colour in an absorbent paper tree, add liquid to the bottom which then gets soaked up and creates crystals on the ends of the branches. The crystal liquid is potassium phosphate monobasic, whatever that is, but I understand there are many liquids that you can grow crystals with.

Where can I buy a bottle of liquid potassium phosphate? I've found crystals for diet supplements but I don't know whether dissolving those in water would create the right kind of liquid. If not potassium, what other liquids could I buy without having to buy the whole National Geographic set again for £££s?

And separately, what do we need to buy for growing freestanding crystals, again without buying a whole presentation pack set like the ones below? They're great but pretty much once and done.

[ScotHill]

otolith said:

Classically, water glass (sodium silicate solution)

https://edu.rsc.org/experiments/making-a-crystal-g...

Cool thank you. Regarding safety, how corrosive/irritating are those chemicals, is it a problem if a child gets it on their hands, if washed straight off?

[ScotHill]

Mr Pointy said:

Google is awash with information:

https://crystalverse.com/growing-crystals/
https://www.amazon.co.uk/s?k=monoammonium+phosphat...

I know but if you're not sure what you're looking for it's often easier for someone to say 'we bought this from here, and did this, and it worked'.