I know this site, Paarma, but thanks anyway.
Check this out:http://www.awm.gov.au/blog/2008/04/11/albatros-fabric-research/
IMHO, TVAL's representation of Mai's plane is dubious...
They used light blue tape (and only on the upper surfaces...why?),
obviously because in the b/w photo of the original plane the taping looks bright,
as light blue appears in orthochromatic film. (but light blue ribbons were used by OAW).
Mai's machine was Johannisthal made. (Johannisthal used salmon that photographs dark in orthochromatic).
1. We don't know for sure, the kind of film that was used in that vintage photo shoot. (panchromatic or orthochromatic).
2. As the the fabric research of the Australian War Museum discovered,
lavender coloured tapes could have well be used by Johhanisthal Werke along with the standard salmon pink.
(lavender=light purple, also photographs light in orthohromatic film).
Just my thoughts...