I never understood the meaning of a bone folder, since my folding lassies told me about breaking fingernails...
Christian
Origami Tool.
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I tend to fold a lot of business cards, which are a pain to crease, and I noticed one day recently that my fingernail was splitting, so I decided to pick one up. I have found it handy for certain situations where a fingernail isn't quite hard or broad enough for, and it also reduces strain on my hands and nails.