Well the thing is it left a brown mark. Like it burned then discolored my skin (a burn scar) on the area I put it on. I thought maybe it was just coloring as it is brownish like the MMS solution but it won't come off. It's definitely a burn. At the time I felt the itchiness/burn like battery acid does.
You applied the Sodium Chlorite straight out of the bottle undiluted/full strength.. is that correct?
IF that's what you did it would have been 'fine' if you wiped it off 'within 5 minutes of applying. This is an awesome way to treat deep burns immediately. I've had to use the MMS for superficial burns a few times and can personally testify it lessens the pain faster than pure Aloe Vera juice.
I finally found Jim's specific instructions;
Burn victims
Any burn should be sprayed with full strength MMS (no acid added) directly from a small spray bottle. Do not add citric acid or lemon juice at all. If you don’t have a spray bottle available apply MMS directly onto the burn, making sure the area is soaked with MMS.
Wait up to five minutes, but no longer before rinsing off. If you fail to rinse off, the burn will continue to hurt. On the other hand if you do rinse within 5 minutes the burn will heal in 1/4 the time normally required to heal. This includes all those terrible skin and flesh burns and it will save lives. The pain should stop immediately or reduce to almost zero within several minutes.