They need to be dropped in the liquid and with the Clear acrylic powder a glasslike free edge can be created. The strength of the colored glass-effect depends on the amount of Crystal Drops put in the liquid. We can get beautiful pastel colors if we use white builder acrylic with the colored liquid. 

Important: brush must be cleaned in clear liquid after use since the colored liquid is absorbed by the fur, or use a separate brush for this purpose.