Page "Sauna" Paragraph 19
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Wikipedia
Pouring a few centiliters of beer into the water that is poured on the hot stones releases the odor of the grain used to brew the beer.
Other scents can be used ( for example pine tar or eucalyptus ), but using any scents other than birch leaves is frowned upon by the traditionalists.
A common method for adding birch leaf scent is to wet the leaves of a vihta in water, and then place the vihta on the hot stones for a second or two.
This also conveniently heats the vihta for use to whip the users skin to increase blood circulation.
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