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What chemical expirements did James Watt study?
Watt was very interested in chemistry.
In late 1786, while in Paris, he witnessed an experiment by Berthollet in which he reacted hydrochloric acid with manganese dioxide.
was there a significant discovery when Berthollet reacted Hydrocloric acid with manganese dioxide?
He had already found that an aqueous solution of chlorine could bleach textiles, and had published his findings, which aroused great interest among many potential rivals.

Question: How did James Watt expand upon the discovery of the bleach solution?
Self-contained rewrite: How did James Watt expand upon the discovery of the bleach solution