On the other hand, the Christy's Light Grey sample swatch is a blend of grey and light blue...???
![Think :-k](./images/smilies/Indy_think.gif)
I still think that lighting and filming technique played a hand in this 'mystery', causing conjecture and lingering questions, for lack of a better term. Artificial lighting causes distortion, futher compounded by the inherent property of felt to absorb light. Even artificial lighting vs. natural sun can significantly effect the shade of color and how the captured image is perceived, to the point that the same article of clothing can look like a different piece altogether. Add to it the fact that felt tends to absorb light.
Another issue...was the sea plane hat the same hat that the German agent wore on the streets of Cairo...he was wearing a tan suit and gray hat? If it is, then the gray hat as seen on the streets of Cairo in full sun is the closest shade to its true color as you will find in the movie. Remember that the sea plane scene and the last scene of Indy and Marion in the movie on the congressional steps, were basically filmed indoors. It has always appeard to me that the sea plane hat was darker than what we would consider a 'moonstone' shade and lighter than charcoal grey.