Re: About HCA
Jesper S. Johnsen (BEV-JSJ@brede.natmus.min.dk)
Fri, 9 Dec 1994 16:43:29 +100
As far as I know the recipe of Kodak HCA is not published. According to
Runo Kohlbeck (Kohlbeck: Bevarandet av Fotografiska Bilder (in
Swedish) Conservation of Photographs, School of Conservation,
Copenhagen, 1987, pp. 78-79) KHCA is made of a 2% buffered and
stabilised solution of Sodium Sulfite. Kohlbeck say that you can make your own
solution by mixing 20 g of Sodium Sulfite (Na2SO4, dry), 5 g Sodium
Bisulfite (NaHSO3) and 0,5 g EDTA tetrasodium. This is for 1 liter of
working solution. I do not know the capacity of this solution, but it
might be the same as recommended for the KHCA.
Jesper Stub Johnsen
The National Museum of Denmark
Department of Conservation