Mercury(ii) Bromide Paper

Mercury( ii ) Bromide Paper Mercuric bromide paper

In a rectangular dish place a 5% w/v solution of mercury( ii ) bromide in absolute ethanol and immerse in it pieces of white filter paper weighing 80  g  m^–2 (Whatman No. 1 is suitable), each measuring 20  cm  ×  15  mm and folded in two. Decant the excess liquid and allow the papers to dry, protected from light, by suspending them over a non-metallic thread. Cut away the folded edges to a width of 1  cm and similarly remove the outer edges. Cut the remaining strips into 15-mm squares or discs of 15  mm diameter.

Store in a glass-stoppered container wrapped with black paper.