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The melt quality of bronze castings such as JIS CAC406 has successfully checked by observing a fractured surface of specially designed test sample on the melting spot. Lead free copper alloy castings, however, are not successfully applied by this method because the fractured surface does not show a characteristic feature or colour. In this study, the cooling curve method cast into shell cup mould was applied to evaluate and establish melt quality. Melts, under various kind of atmosphere such as over oxidised, hydrogen absorbed, flux covered, adequately deoxidised and so on, were evaluated to check the cooling curve in a cup. Owing to the melting atmosphere, liquidus temperature and solidification behaviour showed a distinct difference. Another application of cooling curve method was carried out to deoxidising process in industrially clean melt. Phosphorus content necessary for and also during deoxidising process was well determined.