You can never have enough...

[Lilith7]

I use a varnish medium instead of water to move the colour around with my crayons. It makes it permanent, and lets me layer colour without disturbing the previous stain, so they don't go muddy or murky. And of course as that dries you can then ink over the top, or glue or print or whatever. Magical effects...

And deeply addictive!

Mine aren't water soluble but they sound lovely...

I quite like using pastels too but haven't for a while. Maybe once I get the workroom sorted.