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So they tweaked the chemistry of both inks by adding iron microparticles and dipped the drawing into a solution containing potassium persulfate instead of plain water.

The potassium persulfate reacts with the iron to coat and strengthen the 3D object after 3 minutes of submersion, the researchers report today in Science Advances.

Items would be mass-printed in 2D, then dipped in a bath of the potassium persulfate solution to transform them into 3D.

Henderson said the primary danger to the public would be inhaling fumes from two chemicals: ammonium persulfate and sodium chlorite.