Because we only use the highest quality memory foam for our pillows, we manufacture brand new foam in our factory.During the manufacturing process, the memory foam needs time to dry completely. At this stage, we use a black marker to mark the new memory foam buns with the manufacture date. As a result, some of the foam pieces may have remnants of this ink, but rest assured — it’s completely harmless.Additionally, our foam is CertiPUR-US certified, meaning that it has been rigorously tested for content, emissions, and durability and meets all standards.