Hair Question

[SuspiciousShrew]

Does anyone know why water makes hair darker?

[Suze]

Do you mean when it's wet, or....?

[akurah]

Ask and you shall receive?

Fun tip: you can actually ask Google questions similar to this in plain English and almost always get an answer (aka I cheated and googled). I recently discovered this. For example, for this I asked "why does wet hair look darker"

http://www.sciencefocus.com/qa/why-does-hair-get-darker-when-wet
https://www.reddit.com/r/explainlikeimfive/comments/1ze4s0/why_do_fabrics_and_hair_look_darker_when_wet/
https://www.quora.com/Why-does-hair-look-darker-when-wet

[Arctic]

If you mean when dry, then the water probably has some minerals that affect the colour. For example iron and copper can do this.