[Avodah] Henna parties

[saul mashbaum]

RISober wrote
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AFAIK, we can be lenient with hair dye because she is ainah makpedet - on the contrary, she wants her hair to be dyed, and also because the dye has no independent substance but is absorbed into the hair. (I imagine that the same principle would apply if one were matbil an item of dyed clothing for tumah/taharah purposes?)
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Yes, the same priciple definitely applies. In fact, the case of dyed cloth is cited as a proof of the principle that dye is not a chatzitza (for the two reasons RIS notes).
The Mishna in Shkalim 8:4 descibes the procedure for tvila of the parochet in the mikdash (the procedure varies depending on the level of tumah which affected the parochet). The parochet was wool dyed in various colors. The BY in YD 198 says that the fact that the parochet could be toveled demonstrates that dye is not a chatzitza. The G"ra on YD  198:17 mentions this proof as well.

Saul Mashbaum