Okay, first couple of tests are completed. While browsing through my toolbox I found two rolls of electrical tape - one white and one black and a carpet knife. Great. For experiment #1 I used the white tape. Problem: the white tape was too stiff so that it would not stick properly to the triangular top and bottom edges of the wedge. Also, it would not block the entire light at the edge. The shading of the e-ink surface with the white tape applied did neither improve nor get worse. So I have to rate test #1 as a failure.
For test #2 I used the black tape which was much softer and more flexible than the white tape. It was possible to wrap the tape around the outer edges so that the outer frame of the lightwedge is entirely covered. I wanted to see what happened when the bright outlinig frame of light is removed. Therefore I taped all three edges, including the longer edge on the right hand side opposite the battery cover.
The result is interesting. The light spill is gone almost entirely, but that was the point for me and expected. But what astonished me was the effect this modification has on the shading. While I cannot claim that the smudges are gone, I do see an improvement. Look at the attached photograph and tell me what you think.
In case you wish to try this yourself: I don't think that electrical tape is the right material. It was quite tricky to make the tape stick to the small available surface. The result is so crude that it cannot be used as a permanent solution. The tape already starts to peel itself off. For a permanent solution the edges need to be painted.
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