Czech straightening tape

In the Czech Republic? What is it and why is it needed? If you press the wings of butterflies, then the usual tracing paper is not bad? The pieces of paper that are used to move slides in their original packaging are generally a song.

I use tracing paper (the tape was much more convenient, it's more transparent!

Files for storing papers. Not the most subtle ones. Cut into strips of the desired width

No, plastic is not that, there is little adhesion (the wings slip off constantly) and it does not "breathe", it dries longer. Or maybe my hands are in the wrong place.

Well, the edges of the wing are quite visible on a light background through tracing paper, and even through tissue paper. And what's the point of seeing more? Admire - after removing from the straightener.

If you only knew what this "Czech tape" looks like, you might be able to find a domestic analog. It is doubtful that the Czechs specifically for butterflies plant some special polymer cooks.