[NatureNS] White Birch bark outside becomes inside of strip

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From: Bev Wigney <bkwigney@gmail.com>
Date: Wed, 16 Jan 2019 19:25:22 -0300
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David and all,

I hope I am understanding this question as meant.  Would the curling
action be because the white outer bark is damper and so dries out more
(more shrinkage) and also that it is more fragile?  I'm thinking of
the canoes and various other birchbark objects (round containers,
moose calling horns, etc..) I have seen made by Todd Labrador, and the
white outer side of the birch is always on the inside. I guess there
is also a time when collecting bark - in early spring - when the bark
comes away with an inner layer -- winter bark -- that oxidizes,
turning dark brown -- and can be etched for designs.    I don't know
all that much about such things, but I follow Todd's work on Facebook.
It is quite beautiful and fascinating.

Bev,
Round Hill

On 1/16/19, David <dwebster@glinx.com> wrote:
> Hi All,
>      I have recently been burning some White Birch and sometimes set
> aside some bark to pep up a low fire.
>      When layers of bark are stripped off of a stick, whether thick or
> thin, the outer surface is more pale (white) than the inner. When held
> near a flame the bark curls and the paler outer side always forms the
> inside of the curl whether the pale outer side or the darker inner side
> faces the flame.
>      Why does the outer surface always form the inner side of the coil ?
> Yt, DW, Kentville
>

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