Solid Ink SMP Pigments by Billy DecolaSolid Ink SMP Pigment Set Developed by artist Billy DeCola, the Solid InkSMP Pigment Set achieves the perfect tones for Scalp Micropigmentation (SMP), on any skin type, and it blends with most hair colors. This set includes a Black and 4 tones of Grey. Solid Ink SMP Pigment is used for scalp tattoos that create the illusion of hair. Its perfect for replicating hair follicles or stubble on a bald or shaved head, or for density on a thinning hairline or