Creating colour swirls

Was just wondering if there is a trick Im missing on creating swirls of colour in clear resin!

Ive tried everything!! Waiting for the resin to partially set, adding coloured resin drops, using nailpolish, powders, ink…. you name it!!

Im wondering if my resin hasnt got the right viscosity. Im using jewellery resin that works for everything else.

Ive watched YouTube and copied what others have done, but every time I add colour to swirl it in, the colours either spread out, spring back, settle or just merge 🙁

Whats the secret please??

Thanks

Ten 🙂