"These litmus test strips in my agronomy soil kit show a reaction to lemon juice, therefore soil science is an op - lol, as if dirt is made out of lemons, ha ha, get real, retard!" https://t.co/Srs13XSL7y
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Interesting. I wonder what chemical interaction is being tested.
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color-change strips like this work with gold nanoparticles that bond to sample molecules and diffuse through the paper the test spot has some kind of agent that makes the target molecule stick in place and pile up (and the color you see is the gold)
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