Although two toning can be done on any  wooden surface, I decided to use an unfinished napkin ring as an example.

 

I decided to use a water based stain  rather then oil based.  Oil based stains tend to "bleed" leaving it hard to fix.  I used "golden oak" color stain for the middle part of the napkin ring with a paint brush so that I can easily get into the groove.

 

Once I finished the center, it was time to do the rim and the inside of the napkin ring.  Again with the paintbrush using  "fruitwood" color stain, I stained the  rest.

 

I wiped off the excess stain with a paper  towel, and VOILA! the two toned napkin ring is finished.

..