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soreff comments on Experts vs. parents - Less Wrong
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Very much agreed. One particular worry is that the substances in question are dyes. If someone is observant enough to notice changes in visible color in excretions, or skin color, the blinding is gone.
One another note, the topic of study
almost begs for a bad joke about low-lying excited states...
No one has ever reported observing any such change from food dyes used in these dosages. These are comparable dosage levels to the amount of artificial coloring that most Americans eat every day.
Huh, I had meant that as a point in favor of the studies! Which I suppose it still is, but it hadn't occurred to me that unblinding might occur in that way.