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post #1 of 4 (permalink) Old 08-27-2015, 01:21 PM Thread Starter
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Indicator Solution

Hey everybody,

Has any one ever ventured into making there own drop checker indicator solution? It looks like its only Bromothymol Blue and a 4 dh solution. Anyone know of a specific recipe? Or have any experience with diy?
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post #2 of 4 (permalink) Old 08-27-2015, 03:16 PM
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post #3 of 4 (permalink) Old 08-27-2015, 03:18 PM
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I have no idea how to make Bromothymol Blue. As for 4dkh fluid the recipe is as follows.

Add 3.60g of baking soda to 3000ml of RO water. This gives you 40dkh fluid.
Then take 50ml of that 40dkh fluid and add to 450ml of RO water this gives you 500ml of 4dkh fluid.
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post #4 of 4 (permalink) Old 08-28-2015, 03:45 AM
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For bromothymol blue, I usually prepare it in 0.01N sodium hydroxide and then Q.S. with MilliQ water.

Anthony


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