When using this, it's challenging to ensure it's facing the sun directly. A small stand would make it easier to place on cardboard and adjust the angle until the shadow of the reflector on the cardboard is minimized, thus avoiding to looking directly at the Solar reflector, but there's none, so you'll need to make one yourself. Avoid looking directly at the reflector.
Another fun use I found is bringing the reflector close to my face. I could see my eyelashes, skin pores, and eye much larger, about ten times bigger.