The dye color and sometimes blend of colors have a light filtration selection reduction ability of wavelength i.e. color. Thus the darker one makes the hue of the dye (concentration) you are using GENERALLY the more light filtration or removal that will be filtered from the water. The less the light that penetrates more wavelengths that are being excluded by the dye. Some wavelengths could be unaffected by the dye depending on color of dye.
I think most pond dyes are sold as aesthetic improvement of the water especially if the water is muddy murky - lipstick on a pig. To my knowledge not a lot has been published about what colors and what concentrations have the biggest suppression of pond plant growth. Definitely more research is needed on this topic.
Last edited by Bill Cody; 12/31/16 07:40 PM.
