John Howard Sanden, noted portrait painter, author and teacher, developed the ProMix® System of flesh and neutral tone oil colors. It allows the artist to obtain delicate variations of skin tones quickly and consistently with reliability and control. Non-toxic. The set contains all 10 specially formulated Professional Oil Colors (37 ml each), ProMix® System Color Chart and Mixing Guide and The ProMix® Color System "Color Mixing for Portrait and Figure Painting" book.