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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.
How did James Watt expand upon the discovery of the bleach solution?
he began experiments along these lines with hopes of finding a commercially viable process.
He discovered that a mixture of salt, manganese dioxide and sulphuric acid could produce chlorine.
Did James Watt go on to discover other important chemical solutions?
He passed the chlorine into a weak solution of alkali, and obtained a turbid solution that appeared to have good bleaching properties.
He soon communicated these results to James McGrigor.
did James McGrigor develop the solution that we know as commercial chlorine bleach today?
It was not until 1799, when Charles Tennant patented a process for producing solid bleaching powder (calcium hypochlorite) that it became a commercial success.

Question: Why is bleach sold as a liquid then?
Self-contained rewrite: Why is bleach sold as a liquid then if Charles Tennant patented a process for producing solid bleaching powder?