Color it will generate the corresponding Spanish nubiola u04 ep-37 De color ( max ) chromatic coordinates 0.5 Particle size range ( UM ) particle size range ( UM )8 Tinting tinting strength ( Comparison with standard sample ) ( Compare with standard sample )+3 Resistance to migration resistance to migratory 5 Free sulfur ( max ) Content of Free suphur0.05 Heat resistance ( c ) Heat fastness >300 Sieve allowance ( max ) sieve residue0.1 Weathering weather fastness 8 Moisture ( max ) moisture content1 Acid acid - resistant fastness 1 Water - Soluble ( max ) soluble water content0.2 Alkali resistance of alkali fastness 2-3 PH value 8-10 Oil absorption oil absorption