… Chemical preparations for photographic uses (other than varnishes, glues, adhesives and similar preparations); …
Explanatory notes
… - Chemical preparations for photographic uses (other than varnishes, glues, adhesives and similar preparations); … images visible (e.g., hydroquinone, catechol, pyrogallol, phenidone, p -N-methylaminophenolsulphate and their … (e.g., sodium thiosulphate (hypo), sodium metabisulphite, ammonium thiosulphate, ammonium or sodium or potassium …