Katie for this you will want to very lightly selenium tone first, whether it be MGWT or MGIV and then wash, then mix up bleach at 2g of pot ferri and 2g of pot bromide per liter for bleach. Bleach anywhere from 10 sec to 40 sec. for MGWT and possibly a little longer for MGIV then wash then redevelop in thiocarbamide toner with at least 5g/L of sod hyd for MGWT. My preference for splits like this is dependent on the image of course, but I would recommend starting with 6g/L for MGWT and slightly less for MGIV. You can then adjust from there.
Originally Posted by Katie
Selenium can also be done after sepia toning, BUT with MGWT things can get out of control very quickly, with everything going too reddish brown too quickly.