SePRO Blue Dye PacketSePRO Blue colorant is a non toxic blend of environmentally friendly dyes formulated to give your pond a natural aquamarine color and helps reduce sunlight penetration. Adding colorant to a pond provides two important benefits. Aquatic dyes are used for aesthetic purposes to enhance the natural beauty of water and to limit the amount of sunlight penetrating the water surface. SePRO Blue Benefits SePRO Blue Lake and Pond Colorant is formulated to