Sodium Sulfite undoes Sulfide toning- puzzled.

[tkamiya]

I don't know how long it lasts. I know HCA degrades quickly when exposed to air and it's the same active ingredient. I keep mine in tightly capped bottle. I'll let you know when it dies....

 

[AndreasT]

Ok, thank you all. I will post my new results.

 

[Roger Cole]

The question would be, are the borders also yellowing? If they are, it isn't toning, which affects only image areas. (There are some dyes that are marketed as toners but this isn't one of them.) If white unexposed borders are yellowing, something else is going on. If the print image areas just look too yellow but the borders are not (compare to an untoned print) then it could be what I ran into. I'm not sure why sulfide toning makes inadequate fixing more obvious or fresh fixer more critical (my fixer use was well within the listed capacity) but it sure seems to do so in my experience.

 

[AndreasT]

Well to my horror I have found out my paper is fogged. Very slightly which I did not notice. Only after bleaching a black scratch away on the white border did I see it. Very slight like I wrote but damn it of course toned with.
I brought myself some sodium sulfit anyway, should I mix it with Distilled water if I make a ca. 2% solution.
How do I know if it is no good anymore? What happens to it when it goes bad?