Explanatory notes
… images visible (e.g., hydroquinone, catechol, pyrogallol, phenidone, p -N-methylaminophenolsulphate and their … It should be noted, however, that mercuric chloride remains classified in heading 28.52 even if … Toners to modify the colour of the image (e.g., sodium sulphide). (6) Clearing agents to remove stains caused …