Caffenol chemicals?

koraks said:

It is. Caffenol is a relatively expensive developer and I wonder if an LCA would support the eco-friendliness often attributed to it.

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Eco friendly? It was never the point

It's touted as such by many, though.

Sidd said:

the controls are not very predictable

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The pH can vary a lot depending on how exactly you mix it, if you dissolve the soda first, the CO2 formed during neutralization will make bicarbonate with the excess soda. If you dissolve the vitamin C first and slowly add the soda, the CO2 escapes and the final pH will be higher, especially if you use just a small amount of water for mixing and then fill up to the final volume.
You can avoid this entirely by using sodium ascorbate in place of AA, but then the pH might even end up too high.

So the order to mix things is also important, not just the amounts of each?

I often see the coffee and the soda mixed together, then the vitamin C added to this, is this correct or should we really be splitting the water into thirds, dissolving each, then mix coffee with soda, then with vitamin C? Or a different order altogether?