Some of our artists will do white ink tattoos. We always want our customers to be informed about the limitations of white ink before proceeding. The biggest problem with using just white ink for a tattoo is that the results are unpredictable.
Once white ink is in a healed tattoo, it does not look pure bright white because you're looking at it through the pigment of your own skin. Generally it will show as a few shades lighter than your skin tone, but skin tones can vary from spot to spot on your body so it may heal in a splotchy, uneven tone (especially if used as a solid fill). Also, white works better as a highlight color with contrast, rather than a solid fill.
When against a dark color, white will look brighter than if it is on its own. White ink tattoos tend to be very subtle, very faint, and after 5 years or so (depending on how much sun exposure it gets), might hardly be visible at all. You would have to continue to get the tattoo retouched at your expense much more frequently to keep it looking fresh.
White ink designs need to be fairly simplistic linework designs, using thicker lines (things like small lettering are not advisable). Images of amazing white tattoos on Pinterest have been very popular lately. However, many of the images do not show what happens when the tattoo is healed, they don't show when a tattoo goes unexpectedly wrong.
White ink tattoos can backfire fairly often- a client's skin tone will tint the ink a strange color, which is impossible to predict, and the reason why many of our artists have decided to not offer them. It is always our #1 goal to give you the best looking tattoo possible and if we ever feel that can't be achieved we will advise against it.