Blue toner and copper are not archival, neither will give you more print protection. I think it's a standard blue toner and what you are getting is just a reaction to sulphide toner having another kind of silver compound, probably this behavior will change more or less evidently if you change the kind of paper.
BTW, althought Ian is right, I don't think it's gold toner because depending what formulation and paper it won't turn always to blue, and if you tone first with it, standard sepia with standard bleach shouldn't do too much (never tried) .AFAIK gold toner was always clearly labeled, as well as blue (also know as indigo) toner.
Just my 2 cents.