sentence: The organisation created such a bar in 1889 at the first General Conference on Weights and Measures -LRB- CGPM : Conférence Générale des Poids et Mesures -RRB- , establishing the International Prototype Metre as the distance between two lines on a standard bar composed of an alloy of 90 % platinum and 10 % iridium , measured at the melting point of ice .
question: what was _ melting _ _ _ ?
answers: ice