Quote Originally Posted by Rudeofus View Post
The great thing about this recipe is that you can fine tune pH with Bicarbonate and achieve unbelievable control over the tone you get, from dark brown all the way to very light yellow.
This is a very attractive quality! Until Gerald posted that you could use bicarbonate instead of sodium hydroxide, I had never heard of this recipe. Maybe I should order Thiocarbamide after all...

It does raise the question for me, though, as to why you can't adjust the pH of the sulfur solution using bicarbonate, and control the tone?