Nothing looks worse than a thick layer of concealer slapped on the skin with ink still peeking through. When trying to conceal something with an intense amount of color, such as a tattoo or bruise, the trick is to color correct. Applying a thick layer of concealer will only give a plastic mismatched effect to the skin, and most likely won't cover the ink completely. See below:
Now, unless your photographer is really good at photoshop, or you don't mind looking like you're covered in chemical burns this may not be a very good idea. In order to hide a tattoo, with or without special tattoo concealer, you need to color
So here, my friends, is a color wheel:
I'm sure many of you haven't seen one of these since elementary school, but understanding this is key! Color correcting is all about covering one color with its opposite. For example, a very common trick with concealing blemishes is to apply a green concealer. The green concealer will cancel out the red of the blemish and bring the skin back to a natural flesh tone. Therefore, in order to cover yellow ink apply a purple corrector, orange would be corrected with blue, and so on...For tattoo outlines and shading I use a light peach or orange toned product depending on the person's skin tone. The orange will cancel out the blue/green in the dark ink.
Once you've corrected the color the trick is to work in thin layers; powder, conceal, repeat. I find this works better if you apply concealers that are far too light for your skin. Powder products always make things appear darker, so this trick always saves me from turning the skin too brown or somewhat grey.
You may have to repeat the last two steps a few times, just remember to use thin layers and powder between each one. Best of luck!
My attempt at keeping up with the times...