Digital BW, The Print

helen_bach2003 wrote:

>I thought that Wilhelm mentioned Kodak Hypo Clearing Agent in his
>book, not hypo eliminator. They are two different things. Hypo
>eliminator is not recommended because of the nature of its action;
>KHCA is OK. I must ahve missed the reference to hypo eliminator.
>
>Best,
>Helen 
>
>  
>
Yep, they are very different. Hypo Clearing Agent is mainly sodium 
sulfite, whereas Hypo Eliminator is amonia, hydrogen peroxide and 
water.  And yes I'm sure that he recommended Hypo Eliminator, followed 
by selenium toning, in the first edition of the book in question.  Note: 
not only shouldn't one use Hypo Eliminator, but light selenium toning 
doesn't give near the protection that was once thought, at least it 
doesn't according the the Image Permanence Institute at RIT.