Marbling paints? Advice?

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DD wants marbling paints for her birthday (11yo). Does anyone know what's best to buy? I'm confused at all the choice! And what else to buy?

TIA.

Acrylic paint and shaving foam? I'm not sure about specialist paints but I've seen this done quite often with beautiful results it seems pretty fail safe and you could pick her up a a huge set of decent acrylic paint for £25.

Thanks @LadyDeadpool, much appreciated. I was under the impression you needed anspecific type of paint.

The "proper" paint/ink is special insofar as it sits on top of the water in the tray so you can lift it off on a sheet of paper. I had a kit a long time ago and it had a tray and pipettes to drop the ink/paint onto the water plus sticks to pull the drops into patterns (cocktail or kebab skewers would be fine)

I've never done it with shaving foam but there are often lots of different ways of doing these things with DIY "cheats" to avoid some of the special bits needed for the traditional methods.