A metallic sheen on a gel manicure? One way to achieve this effect is by using transfer foil. The Slowianka foil stands out from other gadgets of this type mainly due to its delicacy. It is very thin and soft, so it easily detaches from the nail without disturbing the desired effect. Transfer foil is applied mainly - but only - to gels. It lends a silver sheen to many nail art accessories - as long as they possess dispersion.