Please tell me what I need to do marble effect with Sharpies?

[sammyc22]

Preferable in a store rather than online, thanks!

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[pinkthistle]

Isopropyl alcohol, the stuff you wipe the sticky layer off gel polishes, each company have a different brand name or it's called finishing wipe in the likes of Sally's. This gets dripped onto the sharpie colours making them dissolve and run I to each other. Then top coat.