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Dyestuffs. Determination of solubility in organic solvents. Gravimetric and photometric methods Ingestion-build-111333 Requirements for installation of UPS1 Scope This International Standard specifies two methods for determining the solubility of dyestuffs in organic solvents. They are applicable to dyestuffs that do not change chemically under the influence of the solvent and are stable and non volatile under the specified drying conditions. For volatile solvents (boiling point < 120 C), the gravimetric procedure is recommended and, for less volatile solvents (boiling point > 120 C), the photometric