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Indrayan, A.K. and B.S. Guleria (2001) Isolation of the natural dye from the heartwood of Caesalpinia sappan and its use as a new neutralisation indicator. [Publication]
Indrayan, A.K. and B.S. Guleria (1997) Isolation and extraction of medicinally valued dye from the heartwood of Caesalpinia sappan using various solvents. [Publication]