I just opened up a bag of char cloth I made over the summer and I had a very hard time getting the cloth to catch a spark. I was using flint and steel and it took about 15 tries to get it to catch. I used it quite a bit over the summer and it worked really well, 1 or 2 tries and it caught every time. The cloth was made from 100% cotton and stored in a sealed plastic bag although it was out in my garage. Do you think some moisture got into it?