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Melting point / freezing point

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The melting point determination of 4 -amino-5-hydroxynaphthalene-1,7-disulphonic acid (CAS No. 130-23-4 )was done following OECD Guideline 102 and according to the metal block capillary method. . The test item shows colour changes from grey to black but remains in powdered form in capillary .The test was conducted in replicates and mean decomposition point was found to be 258.8°C -263.8 °C at  966.8hPa

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The melting point determination of 4 -amino-5-hydroxynaphthalene-1,7-disulphonic acid (CAS No. 130-23-4 )was done following OECD Guideline 102 and according to the metal block capillary method. . The test item shows colour changes from grey to black but remains in powdered form in capillary .The test was conducted in replicates and mean decomposition point was found to be 258.8°C -263.8 °C at  966.8hPa.