If you know how to use it correctly, corn starch is a perfect natural alternative to commercial face powder. I have an oily complexion, and in the past I was never able to keep the shine off my face no matter what brand of face powder I used or how many times I blotted throughout the day. After I switched to using corn starch as a face powder, I can go an entire day without blotting and the most I would end up with is a sort of dewy look to my face, but for the most part my skin stays matte.
|You can fill old face powder containers with corn starch, but if you don't have one, here is a suitable container I found at Muji. The link takes you to the Taiwan store site. Unfortunately I couldn't find this product on the US site. Also, the brush in the above photo is heavily loaded with corn starch so that it would show up better in the picture, but you want to use a lot less powder than that for actual application.|
The downside is, corn starch is very, very white, so it may only be suitable for those with paler complexions. All you need to do is load a little bit onto your powder brush, and remember to tap vigorously to make sure most of the excess is shaken off, then apply to your face as you normally would.
If you have a darker complexion that contrasts too much with the corn starch, mix non-sweetened cocoa powder into it, blending and adding until you get a color that matches your skin tone. The ratio can even be more cocoa powder than corn starch. Then do the same thing for application; load up your brush, vigorously tap off the excess, and swipe it over your face.
I only use corn starch to set my makeup now, and it works amazingly well, definitely better than any cosmetic face powders being sold in stores. It also makes a great "dry shampoo."
I've read online that some people are concerned about corn starch clogging your pores. I personally have not had this problem, and I'm speaking as a person who is prone to breakouts. I think if you clean your face thoroughly (and I mean, really dedicate your time to gently removing your makeup and massaging every crevice of your face to get it clean), it shouldn't be a problem for you either.