The credit of discovery of the first sulphur dye goes to Troost in the year 1861; however, the genesis of sulphur dyes dates back to the observation that cotton cloth was stained in contact with saw dust which had been used to absorb sulphite leaking from a reaction vessel. The French chemists Croissant and Bretonniere pursued this observation and the first patent on sulphur dyes was issued to them in 1873; the product was made by the- French firm of St. Denis and the name of the product was Cachou de Laval.
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机译：Troost于1861年发现了第一种硫磺染料，这是功劳；然而，硫染料的起源可追溯到观察到的棉布沾染了锯末的现象，该锯末曾被用来吸收从反应容器漏出的亚硫酸盐。法国化学家Croissant和Bretonniere遵循了这一观点，并于1873年向他们授予了关于硫染料的第一项专利。该产品由法国圣丹尼斯公司生产，产品名称为Cachou de Laval。
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