Wow, impressive! Just as an aside here Tom, the Moersch Catechol paper developer in working solution form lasts about 3 weeks or 8 separate printing session - fresh, the image comes out after 30 secs; on the 8th session or nearing 3 week old, it takes about 1 minute. I suspect they mix the stock solution with more than just water.

I can't wait for your tests on paper with MS Amidol liquid kit form.

Many thanks,