Wolverf links:
Berkenbast: http://riihivilla.blogspot.nl/2008/04/birch-bark-dyeing-and-madder.html, https://pontagedue.wordpress.com/tag/birch-bark-dye/
Zwarte bonen: https://waysofthewhorl.wordpress.com/2011/04/12/natural-dyeing-take-3-black-beans/
Algemeen: http://laundry.about.com/od/NaturalFabricDyes/a/How-To-Dye-Fabric-With-Natural-Dyes.htm
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