… unmixed products for photographic uses, put up in measured portions or put up for retail sale in a form ready …
Explanatory notes
… unmixed products for photographic uses, put up in measured portions or put up for retail sale in a form ready … (e.g., hydroquinone, catechol, pyrogallol, phenidone, p -N-methylaminophenolsulphate and their derivatives). The … image permanent (e.g., sodium thiosulphate (hypo), sodium metabisulphite, ammonium thiosulphate, ammonium or sodium or …