Griffin Alkyd Fast Drying Oil Color is a genuine oil color made from pigment and oil modified alkyd resin which can be thinned using conventional oil color solvents. It is this unique formulation which allows Griffin Alkyd Fast Drying Oil Color to dry quicker than most oil colors but slower than acrylics. This means that the traditional oil techniques of both impasto and glazing can be done in considerably less time and a painting can be completed in a single session. All colors in the range remain workable on the palette for 4 to 8 hours and are touch dry on the canvas in 18 to 24 hours. The drying time; however, will be affected by the thickness of the paint and the temperature of the environment. Yellow Ochre is a warm yellow. Originally made from natural iron oxides found in earth, it is one of the oldest pigments used by mankind. A synthetic version became available in the 1920s.