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Strange lines in spars

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Xavier

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Hi,
As my lower wings are now finished, some little disappointment I went through during their construction are coming back to mind, sometimes introducing horrible doubts into my mind...
Among them, the strange lines appearing on the faces of most of my spars... By the time I had asked to knowledgreable people who could not tell what that was, but I wanted to know if maybe one of you might have encountered those in the past...
Please note that according to french regulations parts of the wood piece from which the spars were cut was sent for testing by a specialist; tests perfect; the specialist however was not able to inspect the spars themselves.
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