Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Mercury FREE, but virtually worthless....

In the previous review, the author is apparently unaware that the Merthiolate solution offered here is the new "mercury free" formula. This weak concoction is composed primarily of water, alcohol and acetone. Its effectiveness is one star above zero. The original tincture Merthiolate (thimerosal) formula, which contained trace levels of mercury, was discontinued years ago. Regardless of the controversy surrounding its content, the original formula was a very effective antiseptic and served well a large majority of people in my generation.