I would not think the dye will have a "direct" affect on the temperature. My gut feeling is that once the sunlight penetrates the surface, and is not reflected, it will generate heat that will be absorbed by the water. In fact, a light brown bottom will reflect more light than the dye, IMO.

Indirectly, the reduction of plant life caused by the dye may increase the temperature. Someone can correct me but I'm pretty sure that photosynthesizing (sp?) plants absorb heat in the process.

Dan


1 ac pond LMB, BG, RES, CC