1.1 ,This test method covers the determination of the red dye concentration of aviation turbine fuel and kerosine and the estimation of the Saybolt color of undyed and red dyed (<,0.750 ,mg/L of Solvent Red 26 equivalent) aviation turbine fuel and kerosine. The test method is appropriate for use with aviation turbine fuel and kerosine described in Specifications D1655 and D3699. Red dye concentrations are determined at levels equivalent to 0.026 ,mg/L to 0.750 ,mg/L of Solvent Red 26 in samples with Saybolt colors ranging from +30 to –,16. The Saybolt color of the base fuel for samples dyed red with concentration levels equivalent to 0.026 ,mg/L to 0.750 ,mg/L of Solvent Red 26 is estimated in the Saybolt Color range +30 to –,16. The Saybolt Color for undyed samples is estimated in the Saybolt color range from +30 to –,16.