Gandhaka is available in both free and bound forms. Sulfur mixed with metals is available in pure form near volcanic mountains and at other places. Sulfur is found in the form of both sulphide and sulphate compounds.<ref name=":1" /> <blockquote>निमेलस्तु रजनीसमप्रभो दीप्तिमांश्च नबनीतकोमलः । कीर्तितो ह्यमलसारसंज्ञको गन्धको रसरसायने वरः ॥|४।। (Rasa. Tara. 8.4)
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Gandhaka is available in both free and bound forms. Sulfur mixed with metals is available in pure form near volcanic mountains and at other places. Sulfur is found in the form of both sulphide and sulphate compounds.<ref name=":1" /> <blockquote>निमेलस्तु रजनीसमप्रभो दीप्तिमांश्च नबनीतकोमलः । कीर्तितो ह्यमलसारसंज्ञको गन्धको रसरसायने वरः ॥|४।। nimēlastu rajanīsamaprabhō dīptimāṁśca nabanītakōmalaḥ | kīrtitō hyamalasārasaṁjñakō gandhakō rasarasāyanē varaḥ |||4|| (Rasa. Tara. 8.4)<ref>Kashinath Shastri (1986 reprint) ed., ''Ras Tarangini Of Sadananda Sharma With Prasadani Explanation Of Haridatt Shastri And Ras Vigyan Hindi Tika Of Dharmanand Shastri''. Delhi: Motilal Banarsidas (pp. 175)</ref> </blockquote>In Rasatarangini, the qualities of gandhaka are: it should have nirmal (clean without physical impurities), Rajanisamaprabha (yellow colour as Haridra), Deeptimamscha (lustrous) and Navneetkomalah (soft like butter). Only Amalasara Gandhaka has these properties, so used for many medicinal preparations.
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nimēlastu rajanīsamaprabhō dīptimāṁśca nabanītakōmalaḥ | kīrtitō hyamalasārasaṁjñakō gandhakō rasarasāyanē varaḥ |||4|| </blockquote>In Rasatarangini, the qualities of gandhaka are: it should have nirmal (clean without physical impurities), Rajanisamaprabha (yellow colour as Haridra), Deeptimamscha (lustrous) and Navneetkomalah (soft like butter). Only Amalasara Gandhaka has these properties, so used for many medicinal preparations.