Index Name Index Paste Powder Appearance Grey white to light grey Grey white to light grey H-acid Monosodium Salt % 42±2 85.0 Alkaline insolubles ( on 100% base ) % 0.2 0.2 Chromtropic Acid Di-Sodium Salt ( on 100% base ) % 2 2 T-acid Di-Sodium Salt ( on 100% base ) % 0.5 0.5 Moisture Content % - 5