I know that I should not burn wood that looks gray in color. I have about 2 cords of maple and cherry that was cut and stacked this time lasy year. I also have some oak that a friend gave me that is 2 years old. I did not cover my wood at all last year and we had a pretty dry summer. All of my wood looks gray?? This is my first time not covering my wood. I usually just go by the cracks on the ends to check for dryness. If it is too dry do I mix in green wood and if so how much? Im just trying to avoid backpuffs.