It’s ink.
Love the product. Highly recommend
I bought a personalized stamp from Riley Print a couple of years ago (that I adore). When the ink pad finally started to dry out, I bought this refill bottle. Since you only use 7-10 drops to refresh the pad, this bottle is going to last a lifetime! The color (blue) is very rich and classy, and my stamp works even better than when I bought it. I would definitely buy another stamp from Riley Print!
Product arrived fast and as advertised