Usually when we talk about reflector we opt for a nice diffused reflected light. Something like a foamboard or a big bed sheet. Those produce nice soft light when reflected by the sun.
Photographer Rich Meade shares a DIY for a different kind of reflector, a High Fashion Specular Reflector or “shiny board”. This reflector is not diffused at all, it is rather mirror like, with the exception that is it not as smooth.
Rich Create this reflector from a dismantled picture frame and an emergency blanket (and of course some gaffer tape). Though it could have just as easily be done with foamboard which we love so much. The results are, as expected, not soft al all. They are like a game of catch with the sunlight. Kinda reminds me the work that Nick Turpin does with flashes and snoots.
for the full instruction and more samples head over to fstoppers.