The second part.
It is said that the Dunkelgelb RAL 7028 or Wehrmacht Olive (FS 595B; 33275-33434) was introduced on 18 February 1943 roku with Heeres Mitelungen instruction no. 181, but in fact the vehicles painted with Dunkelgelb appeared in winter 1942 roku. The instruction mentioned above introduced the new kind of the camo that consisted in painting on the main colour Dunkelgelb RAL 7028 ,that was made in factories, irregular spots, small spots, or other patterns with Olivegrün RAL 8002(FS 595B; 34510 - 34259) and Rotbraun RAL 8017 (FS 595B; 30117).The whole pattern of the camo was adapted to area conditions and year seasons.There are the "autumn camo" with the brown colour mostly and "spring-summer" one with the green colour predominantly. However,all vehicles were painted with two camo enamels very often.Thanks to that three-coloured patterns of camos were available.There were also vehicles used with manufactured painting only,especially during the Kursk battle period in July 1943.
There samples of the colours:
1-dunkelgelb
2-olivegrun
3-rotbraun