Ken Merrick wrote a multi volume work on Luftwaffe camouflage. He told me, when I was drawing an Ar 234, that in the late stages of the war the camouflage applied to the Ar 234 was not applied as a thick paint, rather it was spray as a thinner wash, so didn't appear as bright as you see in the colour chips. He said the NASAM restoration was incorrect in this resepect because they had applied the top-coat in a solid opaque application and as a result the colours were very bright.
Now this conversation was many years ago, so I I can't fill you in on any of the other details...like was the top coat sprayed straight over the manufactured finish (light grey filler over join lines etc and the rest dull natural aluminium), or was there a light spray of primer first.