Rubbing Screen tone is very useful to make your own manga more beautiful. it is Handy to make gradation.
If you have trouble to add screen tone, visit here.
Hint! Rubbing screentone effect!
Where we can buy Screen Tone?
-Well, we can buy in Japanese bookstores in your town,
the best screen tone, i think is ic.inc product. Or you can buy that in amazon.com
After add screen tone into your draft, you can rub with your hand (Don’t use nail!) or other blunt thing to make the screentone stick into your draft!
Use comic paper or don’t use hvs because it too thin