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In the past few weeks, artists have been laboring over details, trying to bring their initial renderings closer to the images envisioned by Oregon's commission, while still producing drawings that are "coinable" - capable of being reduced to the size of a quarter and stamped onto mass-produced silver-alloy coins.
To date, API has thermochromatic, coinable, chemically reactive, pearlescent security and black light sensor inks.
They are also partly motivated of course by the same hope of attracting grant money--just as the earlier alchemists needed to persuade powerful patrons that they were going to produce real, coinable gold.