now that you have a cleaned and graffitied coin, it may be good to hold onto it for other learning and experimenting such as trying to tone it and other things you'd consider playing around with on a cheap coin for educational purposes. give it a soak in pure acetone if you choose to do this though as you wanna get off any remnants from your cleaning as to not mess with your results in anyway from having a foreign residue on it.
Feel free to call me Will.