... ,dye,ink 3.BV,SGS,ISO 4.Free sample Colourless transparent liquid Xylene,xyloy,Dimethylbenzene,o-Xylene for paint1.China larger ... is not darker than 1000ml, containing 0.5g Potassium dichromate standard solution Color of Acid layer is not darker than 1000ml ... , containing 0.7g Potassium dichromate standard solutionTotal sulfur contentmg/kg ≤ 31Evaporation residue mg/100ml ≤ 51. ...