I sometimes lightly bleach, sepia tone, then lightly rebleach and refix. The second bleaching strips away density from 'underneath' the sepia areas giving them a glow. If done carefully, it need not affect darker tones. Can be a very handy technique for certain subjects. Handy in the UK where sunlit areas might need a touch extra help (cos the sun if often low intensity if present at all). Have to be careful not to overdo it as the highlight can end up flat sepia with little density or contrast.