Patent ID: 8273697

Claim:
A liquid pipe unblocker solution comprising: one or more strong acids, a colored indicator chosen from malachite green, brilliant green, and light green SF yellowish, wherein the colored indicator is capable of assuming at least three colors in the range of pH of 0-1, and wherein the colored indicator is colorless for pH above 7 and wherein the colored indicator is from 0.001 to 0.02% by weight based on the total weight of the pipe unblocker solution; and a surfactant selected from a salt of a (C 1 -C 20 ) alkyl-aryl-sulfonic acid, a salt of an aryl-sulfonic acid, a salt of an (C 2 -C 20 ) alkenyl-sulfonic acid or a mixture thereof, wherein the surfactant is up to about 5% by weight based on the total weight of the pipe unblocker solution.