What fluid/dye to use for transpiration experiment? Watch

80s Love Child!
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What type/name of fluid or dye should I use for a transpiration experiment? Basically, I'm planning to use a potometer to measure transpiration rate of 2 different species of plants.
Im doing AS-level Biology OCR planning exercise.
I just want to be clear on the materials/equipments to use.
Any help would be very much appreciated. Many thanks:tsr2:

Sorry about this, I couldn't find anything on Google.
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Comp_Genius
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any dye will work I think... e.g. eosin.
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80s Love Child!
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okay, thanks for the info.
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WokSz
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just out of curiousity, why are you using a dye? Whenever we did it, no dye was used.
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80s Love Child!
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So that you would be able to see the position of bubble along the scale more quickly & easily.
It's not really necessary to put dye/fluid, but it's a good point when writing about improvements & how was I able to conduct the experiment accurately.
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