Thank you for that explanation. What were your measurements of the proportional stain density of the Hydroquinone based developer that you formulated when read through the blue channel and if you have it, the UV stain density as well when compared to the visual density?

Also the comparative values of the Pyrocat developer with the same readings.

This may be of interest to those who have an aversion to catechol or pyrogallol based developers.

Thanks again,

Donald Miller