My experience is that D-76 dissolves quickly at 110 degrees or so, except for a few suspended white particles, which will disappear soon.. Even with these particles visible, the liquid is perfectly usable. Solution is not complete, however, if granules still collect on the bottom of the container as soon as stirring stops. Solution can be accomplished at temperatures lower than the recommended 110 degrees, but it takes longer.(posted 8207 days ago)