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The dose makes the poison though. Tartrazine is already in cosmetics, but that doesn't mean a ton of it is still safe.

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> already in cosmetics

Rendering transparent rather than covering up would be kind of an anti-cosmetic use.

Yep, which is one of the reasons why this discovery is so weird.

The reason I mention cosmetics, is it means that it's at least in theory skin-safe for humans up to at least some threshold. The next questions would be: what's the threshold at which it's not skin-safe for us anymore, and is that high enough for this effect to happen? Neither are foregone conclusions though.

Another reason to avoid tartrazine. Who knows what its doing to our insides.

That isn't remotely what I was saying. You can die from drinking too much water, that doesn't mean you should avoid drinking water for fear of what it's doing to your insides.

Of course. My comment was based more on this study. It’s concerning that it has this effect.

Why is the effect concerning? If you pour water on undyed cloth, it has the same effect and makes the cloth much more transparent, but that doesn't mean that the water is damaging to the cloth.

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