Mags are generally the only needles that one would want to use on a tattoo for coloring, although Round Shaders can be used for saturation nicely. For most graywashing you would want to use a round shader or a mag, but it is up to you as the person doing it to make that determination.
I tell apprentices that I teach to think of tattoo needles as paintbrushes, and the rest will follow. You wouldn't use a fine detail brush to fill in a large area of a painting, and that is doubly true for tattoo needles. One of the biggest things that you need to learn when starting is that you really have to pay attention to the amount of trauma you are putting on the skin. If you are just grinding and grinding away at an area because you are trying to color an area of skin that needs a large mag with a round shader, you will be wasting your time and your clients because it will take a long time to heal, there will undoubtedly be scarring, and a good deal of the ink that you are putting in will come out.
But with mag needles, generally you may have to turn your power supply up just slightly higher than you would have it for a smaller needle, but depending on how well your machine is tune, this is not always the case. Best of luck.
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7 or 9 magnum or a 14 round for heavy filling such as tribal .......
You can if you need to, but I would not recommend doing this for a whole tattoo. Not that there is anything wrong with it per se, but you are taking at risk unneeded trauma to the skin with this configuration as opposed to using a nice tight Round Liner.
There are 2 bottles in a magnum
The screw that tightens to hold the needle in place, and loosens when you want to change the needle.
You place the loop of the needle over the armature bar coupling. This will be held in place with either a disposable rubber hat, or with a piece of paper towel to firmly hold the needle in place and to ensure that there is no play with the needle, which is to say that it will be loose and the needle with rattle around the armature bar coupling and it will make your line work and coloring look erratic. You will set the the bar so that the needles are on the bottom of the bar riding against the tube, not the other way around. Needles straight out of the pack are completely straight, and you will need to bend the bar of the needle a bit to make sure that the needles are completely against the tube. You will then wrap rubber bands around the machine and over the needle bar to make sure that the entirety of the needle is snug and moving around. This is something that you should know well before you ever tattoo a person, so play around on your own legs to get the feel of tattooing before you ever mark another person. Best of luck.