I am seeking comments from the newsgroup about a "new/different" idea
that I have for reversal processing of b/w film.

I thought of this method since I am hesitant to use potassium
dichromate (I have a KG of this stuff unused
for past 7 years), or potassium permanganate(sp?) and acids.

Here are the steps:

1. Expose and develop film
2. Wash the film while it is still in the tank. DO NOT FIX.

3. Use  sulfide or thiourea to convert the remaining halide (this
would be the positive image)
   Now the entire silver halide has been converted to either silver
metal(because of development) and
   some sulfide. There is no more halide left in the film.

4. Use rehaloginating bleach (ferricyanide+ bromide) This will convert
the metallic silver(-ve image) to halide.

5. Fix the film. Negative image is removed by the fixer, and the
positive image, in form of silver sulfide
  remains. Sepia toning is already done!

My question is, would this work?
The major question is about step 4. I am assuming that the
rehaloginating would convert just the silver, but not the
silver sulfide.

Is this assumption valid?
I know this is a round-about way of reversal processing, if at all
this works, but I am still curious.

thanks for your comments,
Sreenath