This will give you some tissue to remove should the blackening get out of hand. Consider it a small insurance policy of sorts. Gently place the tissue into a culture vessel, pushing it slightly into the surface f the media. I have found that 6-10 inches from standard fluorescent lamps is sufficient for Musa in culture. For the hobbiest - there are a number of folks on this list with fantastic ideas about home tissue culture.
Many folks are also willing to trade materials and cultures.
The traffic is light and the people are very welcoming. A listserve populated by scientists from around the world. Can be very technical, but the information simply cannot be beat. This is a place for great information, the homepage of the Home Tissue Culture Listserver, and a fantastic source of information. The KCK is an excellent way to get started in the hobby and comes with a fantastic handbook full of good info.