Indeed, Tengah Type ! When the Pink Pigs turned up at KKIA, I compared the f. stop at 1/500th with a normal white TriStar. It was a whole stop - which IIRC meant that the pink ones reflected half the light of the white aircraft.
During ULAS times, one of our last student syllabus exercises was low level manoeuvring. If Brize was quiet, I would ask to route on the 'Charlie Delta' back to Abingdon via Brize at LL - which was usually OK'd. As we approached, I'd ask the student to count how many VC10s he/she could spot. They usually saw the trucky ones, but rarely the hemp tankers until I pointed them out. This was to show them that even at a sedate 120KIAS / 250 ft visual target acquisition was much more difficult if the target was camouflaged.
However, as BV infers, acquiring the target with the Mk1 eyeball is now a thing of the past - so probably less need for tone down paint schemes these days.