Are there safe inks that allow one to eat a fish after painting it?
I Googled &quot;edible ink&quot; and found this item, which is a set of edible ink-containing pens.
The keyword is &quot;edible.&quot; I'd stay away from anything not specifically labeled &quot;edible.&quot;
Finally, it is safe to eat fish adorned with ink specifically certified to be safe to eat.
Disclaimer: There might still be some issues with the fish, so keep your eye/nose on that.