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Oh great, I've got some of that, might as well order a 100ml bottle of 4dkh for the same price as the mixed smaller bottle How many drops of Bromo blue do you put in the drop checker with the 4dkh?
I've got 3/4 bottle of 4dkh and 3/4 bottle of bromo blue in the cupboard if you're interested? A couple of years old but I've no need for it now. Drop me a PM and I'll check it is still there.
The solution in the first post is reference solution. Not what you want. It is for the drop checkers that have 2 compartments.
1 for your 4dKH solution and then this goes in the other one. It is to see a comparie the colour between the reference (linked in first post) and your actual reading.
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