Making own 4dkh and Ph indicator All DIY! - The Planted Tank Forum
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post #1 of 4 (permalink) Old 02-26-2019, 10:19 AM Thread Starter
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Making own 4dkh and Ph indicator All DIY!

I watched some videos about how to make own 4dkh water to make a co2 indicator solution. it is quite simple. It requires only distilled water and baking soda. But at the end you need to put some drops of ph indicator to make it standard blue color, which again needs to be purchased. I also want to make that diy too.

It seems there is a way to make ph indicator with red cabbage. like here:
I'm very interested if we can put together all theese and make our own diy co2 test solution from start to finish and use that forever

I know one can buy theese from the market with reasonable price. But in here our country, this little 50 lm test solutions can be very stupid prices. and needs to be purchased again every 2-3 months.
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post #2 of 4 (permalink) Old 02-26-2019, 10:59 PM
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The active ingredient in the normal pH test kit is bromothymol blue; if you can manage to purchase that, you are set.

Bromothymol blue is a bit tedious to dissolve. A little bit of ethanol or sodium hydroxide helps immensely.

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post #3 of 4 (permalink) Old 02-27-2019, 07:17 AM Thread Starter
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Quote:
Originally Posted by Darkblade48 View Post
The active ingredient in the normal pH test kit is bromothymol blue; if you can manage to purchase that, you are set.

Bromothymol blue is a bit tedious to dissolve. A little bit of ethanol or sodium hydroxide helps immensely.
Thanks for the info, I think theese test solutions measures the ph change by color. So maybe I can use the cabbage for this ? The question I think is, Can it be sensitive for 1-2 point ph change and change the color ?
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post #4 of 4 (permalink) Old 02-27-2019, 01:52 PM
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Every pH indicator has its own range. Bromothymol blue is popular because its range is pH 6 to 7.6, which is just about right for most aquaria, and it is fairly stable, relatively nontoxic, and not too expensive. High pH tests use cresol red with the range 7.2 to 8.8. Outside these ranges, the color saturates.

If you want to use cabbage indicator, you'll have to calibrate it to get the color transition at the right CO2 level, which may mean experimenting with the dKH of the dropper solution (4 dKH may not be right for cabbage indicator.) And the indicator is an anthocyanin, a natural compound that is not terribly stable, so it won't last long in the bulb. But if you plunge ahead and figure out the calibration, I'd love to hear about it.
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