Smart Tags are functional elements that combine 2D bar codes and environmental sensing into a cost effective tag that can be attached to e.g.product packages, where additional elements should not increase the product costs. Because the Smart Tags are sensitive to environmental conditions, they are dynamic thus enabling context aware services. The enabling technology behind these Smart Tags are functional inks, such as thermochromic and photochromic inks. Functional inks are available commercially for analog printing technologies, but availability to digital printing is limited. In this paper we have shown that it is possible to formulate functional inks also for inkjet printing.