Electrolysis of concentrated NaCl

I conducted an experiment on electrolysis of concentrated solution of NaCl. Hoffman Electrolysis Apparatus was used for this experiment. I observed a formation of gas bubbles on both anode and cathode. It was expected to obtain hydrogen gas on negative electrode (cathode) and chlorine gas on positive electrode (anode). I also hoped to test these gases: (1) as hydrogen should ‘pop’ with a lighted splint, and chlorine should bleach damp litmus paper. I was unable to demonstrate these tests for gases, as I suppose there was not enough gas formed for test to go efficiently. I wonder, if someone knows what apparatus is better for this goal. I used 9V battery for this electrolysis experiment.
Even though I had no direct proof of hydrogen formation, solution near anode smelled as a chlorine gas, and smell was very strong. I am not sure why wet blue litmus paper didn't get bleached by this chlorine. Blue litmus paper got bleached very fast in another experiment (not related to electrolysis) where chlorine was released, within 30 sec of exposure.
The most interesting part of experiment was formation of brownish chemical species on anode. At times, I didn't see any chlorine bubbles at all, but I could see formation of this brown chemical species. At first, I thought it is an iodine. I tested it with starch and found, that it was not iodine. Today I tested it with alkene and alkane, and I found it was a bromine (decoloration of bromine water was observed with alkene, but not alkane). Yes, I know, that brine is main source of bromine, but is there any way I can buy NaCl without bromine, just for demonstration purposes? 


