Prepare by adding carefully, while cooling, 700 ml of sulphuric acid (relative density at 20 °C: 1,84) to 350 ml of distilled water.
After the solution has cooled to room temperature, dilute to 1 litre with water.
Dilute 80 ml of ammonia solution (relative density at 20 °C: 0,880) to 1 litre with water.
Textual Amendments
F1 Substituted by Commission Delegated Regulation (EU) No 286/2012 of 27 January 2012 amending, in order to include a new textile fibre name, Annex I, and, for the purposes of their adaptation to technical progress, Annexes VIII and IX to Regulation (EU) No 1007/2011 of the European Parliament and of the Council on textile fibre names and related labelling and marking of the fibre composition of textile products (Text with EEA relevance).