The best way to artificially tone a coin is not to try. While natural toning is valued by many collectors, anything intentionally done using heat, chemicals, etc. will reduce a coin's value.
One way you can tone a silver coin (which is a slow working method) is to put it into a manila envelope and place it on your windowsill. I've heard it can take a few months until it finally tones, but it works.
You mean ARTIFICIALLY INSEMINATED ? (A correct question is the best way to get a correct answer)
10 pound is the thing
Tone
The best way to do that is to take it to a coin collector.
The best way is to rub ketchup!
magic coin tricks are a sleight of hand, best way to learn is as an apprentice.
The best way is to do a Google search.
steroids!! lots of steroids!!
put it through your computer
Reflective and Descriptive (APEX) !/
If you want to tone your abs, the best way would be to start out with some jogging, then tone with crunches and sit-ups. You could also try a professional workout, like the Spartacus Workout.