Do You Really Know How to Wear a Face Mask Properly?

If you are with flu, do you know how to wear the mask properly?

Some one says the white side should attach to the face and the blue side should be outside when you are ill so that it can prevent spreading microorganism to others. If you are not ill, the white side should be worn outside and the blue side should attach to your face to prevent from being infected.

But is it all ture? In fact, no matter you are with ill or not, you should wear the mask with the white side attaching to your face and the colored side outside, which is the proper way to wear a mask protecting people from microorganism.