Some chemical compounds (the one that triggered this questions for me was LSD) can be absorbed through the skin into the bloodstream and should be handled with gloves, while some others are harmful (e.g. ammonia) but aren’t absorbed into the bloodstream? Is it a matter of solubility?
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In this case size matters. Some molecules are tiny and are not repelled by the natural oils and so they can enter the stretchy pores of our skin. I don’t know the role of the sweat and the solubility.
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