And has been done away with since, although some museums and manufacturers did not get the word yet.
That photo suffers from a mixture of the limitations of the film and the camera used as well as the printing processes of the day, the bluish fields are most probably grey, that colour has been used on other Egyptian equipment as well. FYI, on my monitor the blue cast is pretty indistinct, so your settings come into play as well.
Information not shared is information lost.
1/87er, die feinmotorisch flinke Elite des Modellbaus.