Doreme Liquid pigment line has the lightest viscosity, similar to ink consistency, where it can be poured out. This pigment line is meant for machine use - micropigmentation. Using a machine that looks like a pen, you would insert the pigment into the Dermis layer. But because you are using the pen to deposit a larger amount of pigments, liquid viscosity will work the best. Machine work also tends to go a little deeper as well.