The tattoo machine is not all the best tool when it comes to dotwork. As it requires you focus on every details of the image. You must realize how powerful of the symbol is to get all the inked right. It requires patience and consume time. This technique is often used for religious or spiritual tattoos that convey their cultures and beliefs. Some Geomatirc image also uses this technique. 

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If you go to any tattoo shop to get some dotwork done, make sure you get the right artist who are extremely specialized in hand poked. Of course, the price is not cheap but the results will last with you forever that you will never ever regret.