Тема: How carbon paper is made - material, manufacture, making.
Even up to the twentieth century, copying documents for business purposes was a difficult, labor-intensive process. Copy clerks, like the scribes of churches and government offices before them, were common in the business offices of the nineteenth century.
The first attempt at copying important business correspondence is attributed to the Scottish engineer James Watt, who improved the steam engine. Watt disliked trusting scribes to copy business letters, so he invented a method of pressing a tissue paper that had been moistened with special liquids onto an original, which had been written using special ink. By 1779, he was ready to market the process, but it didn't catch on.