Collistar Magic Drops Face Concentrated Self-Tanning Ultra Fast Effect 50 ml with just a few drops of its unique texture, it will give your skin an instant golden color that, in less than an hour, turns into an intense and luminous tan, just like after a day at the beach or a UV lamp session. This is thanks to an exclusive formula that combines walnut extract with the innovative DHA Rapid, a new generation self-tanning molecule that halves the coloring time of the skin and guarantees a fast, natural and uniform result, without the risk of unaesthetic spots.