[pure-silver] selenium toner mixed with HCA

I've read some posts looked at "The Print" as well as other places. 
Read instructions on the bottle of Selenium toner that I have (not the
Kodak kind, something in a brown square bottle, hey it was on sale).

What is the advantage of mixing selenium toner with HCA as opposed to
just plain H20?

Looks like, in preparation for toning, I ordered some Sodium Bisulfate
to make HCA.  But just wondering what, if any, advantages or
disadvantages of HCA vs H20.

TIA!

-- 
Eric
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