Control contaminated.

My control experimental plant culture has contamination. And on the other side of this picture there is Black Death starting at the base. But the one I experimented with iodine as an antibacterial is fine. I also read a bit up on it and apparently I should have dipped the plant leaf in dilute bleach then purified water. Then, oh,I can't remember off hand but I think it was a 70% ethanol dip, may have been just on the cut end for the alcohol and using African violet as the nutrient. I was tired when I read it so don't use this as an instruction by any means its just a pointer from what I remember. The other one appears healthy though.