I've used Xtol for years now initially mixing with tap water which, in my case, is very good water as it comes directly from Hetch Hetchy (Yosemite National Park snow melt). But over time I noticed the tendency of a black stringy precipitation to appear in the developer as it ages. I switched to using distilled water and that no longer occurs. It's important to completely dissolve Part A before adding Part B. To check dissolvement I shine a strong "Mag Lite" down in the solution and look for particles in the solution. Only when all particles are completely dissolved do I add Part B and continue stirring until all particles of it are completely dissolved.
Thomas
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