The Sodium Carbonate solution (which cannot be made as concentrated and subsequently you use more to get to the same alkalinity) also tends to have the carbonate grow Xtls in the bottom of the bottle. It is also v. close to saturation and gets hot enough when mixing it, that it may be beyond it initially v. the r.t. solution? Any way, it seems to work fine even with Xtls in the bottle. One way around the question of concentration might be to make the solution B saturated on purpose in the first place so there's always Xtls in the bottom of the bottle...then so long as you don't have major temperature swings (a challenge with basements, too, btw, in some parts of the world) the concentration is "guaranteed" to be constant. Then just tweak your development if you can tell any change from the "standard" concentration. Meanwhile, mainly listen to Sandy not me, he developed the stuff, iirc. Someone said "order more"? I know you can, but why not mix it from powders? way less costly to ship.
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