A popular coffee brand, New Mexico Piñon Coffee, issued a voluntary recall of its Dark Pinon Single Serve 10-count coffee pods over concerns that ink from the lid was potentially contaminating brewing.

The U.S. Food and Drug Administration issued a recall notice on June 20 stating that the clear coat seal on the lids of single-use coffee pods was not applied consistently to all cups in the production run.

“This resulted in the food safe ink printing on some cups to run when exposed to high temperature, high-pressure water used in a K-Cup machine,” the statement said.