Gordon’s, gallon, concentrate, pondmaster watercolors shimmer blue, contains blue colorant, imparts an inviting shimmer blue color to lakes and ponds; may be immediately used for fishing, swimming, irrigation and watering livestock; won’t harm people, horses, livestock, fish or other aquatic species; treats one acre of water four feet deep; use at 32 ounces per acre foot of water; easy-to-understand dilution instructions for the most common pond sizes.