Understandable. I don't know if the procedures are the same all over the world, but I do know that in the United States, and in California, a plastic bracelet is used, as well as a chart and label on the infant bassinet. The only ink applied to the children might be if the parents want the infants footprint. They also prick the bottom of the foot to check the blood. As far as I know, no ink is applied to the child's arm. Identifiers are bracelets and charts.
Another thing to consider is that the ink has been on these Inklings for months now. Considering that they have likely been in all sorts of weather and rummaging through grody stuff, those numbers should either be smeared, illegible, or completely gone.
That and the mention of the home made tattoo pen in the Devil's Workshop suggest they are permanent tattoos.
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