I urge everyone to bookmark that blog; it is always a fascinating tour of the weirder and wonderfuller places on our planet. And let me leave you with this simply jaw-dropping video of undulatus asperatus in action.
(A sunscreen with a physical block like titanium dioxide or zinc oxide can be applied last, after a serum or moisturizer.) Apply a serum next and, finally, moisturizer if you need it. Polis also recommends serums or sunscreens with moisturizers built in because they save time.
Serum Chemistry: 1  Plain or serum separator tube (red top or SST, red/camouflage top): SST tubes should be at least 50-80% full and should be mixed. 2  Heparin tube (green top â chemistry/blood gas): Tubes should be at least 50% full.