Peter Woulfe (1771) Experiments to shew the nature of aurum mosaicumАрхивная копия от 22 декабря 2016 на Wayback Machine. Philosophical Transactions of the Royal Society of London61: 114—130. See pages 127—130: «A method of dying wool and silk, of a yellow colour, with indigo; and also with several other blue and red colouring substances.» and «Receipt for making the yellow dye.» — where Woulfe treats indigo with nitric acid («acid of nitre»).
Peter Woulfe (1771) Experiments to shew the nature of aurum mosaicumАрхивная копия от 22 декабря 2016 на Wayback Machine. Philosophical Transactions of the Royal Society of London61: 114—130. See pages 127—130: «A method of dying wool and silk, of a yellow colour, with indigo; and also with several other blue and red colouring substances.» and «Receipt for making the yellow dye.» — where Woulfe treats indigo with nitric acid («acid of nitre»).
