This is one of my favorite ink sets. My teacher at Ohio University was Arnold Gassan. Arnold wrote one of the definitive text books on the history of Photography. His text books are still highly sought after:
Arnold taught me most of what I know as a darkroom printer. He encouraged me to study the chemistry of photography. Although his tutelage was difficult (at best), his insistence that we make our own chemistry, fully understand the zone system, and become skilled practitioners of the darkroom was very influential in my later work as a development printmaker.
Arnold was very ill in his later life, suffering from terminal cancer. We had been in contact frequently and I was helping him to sort out some digital workflow. I asked Arnold to make me the definitive short-bath Selenium toned print on his favorite Ilford fiber based paper. That print was used for the *ab values to formulate Selenium K7 inks. We actually produced a software for use with our chemist that would allow us to achieve the match during formulation.
Selenium K7 is one of my favorite inks because I like Selenium toning – and I had so much respect for Arnold. It is also the first ink that I formulated that is also glossy compatible when used with the MPS shade 1 and the Piezography Gloss Optimizer.