Richard I have asked you this before and have not received an answer but will try again:
How did you get your chips so clean? Did you do the vinegar thing with a dental pick or?
Did you seal the concrete or just wash it up a bit to get the loose bits off with a toothbrush or?
I ask because I have 4 or 5 and want to keep a couple and give the others as gifts or in contests,and want them to look sharp. Can you help?