Gretchin as guinea pigs for Hulk and a look at Logan

In addition to my ongoing work on Iron Man, I plan to start painting the Knight Models The Hulk white metal model kit soon. But before a single drop of paint is applied to The Hulk, I will need to figure out the proper green skin tone to use. To help me with that will be four little gretchins, half of which is primed in white while the other half is in black.  In theory, these gretchins should