Diode laser here.
I use the baking soda and water mixture and get a darker image. some people here have had their burns turn a bit yellow though.
That has not happen to me so far.
I do not use a spray bottle, I brush it on with a small brush.
I found out about it from youtube.
The video used 2 table spoons of baking soda in a spray bottle, I did not have a spray bottle at the time. All I had at hand was a small 3oz bottle.
I added some soda and water and shook it up and brushed it on.
The concentration of soda in the water is heavy, in fact the soda collects at the bottom.
I have had fair results, I think. I am new at this so may not know what I am talking about.!
edit:
I remembered that while I was looking for more information on the baking soda “trick” I ran across a discussion about it and they were taking “chemistry” about how “base” solutions altered them make-up and allowed more browning to occur and that other “basic” solutions would have a similar result. Not being a chemistry major I decided on safety, selfishly, I did not look for anything else to darken the burn in fear that I might hurt myself and die.
