Whole milk powder made from early or late season milk may form an unaccepta
ble amount of residue when added to a hot (80 degrees C) solution of instan
t coffee. The residue is a precipitate and not simply insoluble milk partic
les (Teehan 1997). This paper is concerned with the characterisation of the
precipitate and the relation between precipitate formation and the composi
tion of the casein micelles.