Fumeless replacement for gold brite dipping solution

Dear Sir,

I am in jewelry manufacturing.We make a gold plating solution by using common salt, soda (Not the eating soda),sulfuric acid, water and heat this solution with pure 24 carat gold, which gets dissolved in this solution.

Then once our jewelry is finished we heat this solution and put our articles in it and heat it and then stir it with a copper wire which aids the gold in the solution to deposit onto the articles,but with a blackish tinge.We then put these colored articles in boiling hot sulfuric acid and the blackish tinge is gone leaving a bright gold yellow 24 carat color.

I need some chemical which can clear this black tinge and give me an equally bright yellow(24 carat Looking)color without the fuming instead of the sulfuric acid. It has to be a chemical as we do not have space to put a scrubber unit.

You can use next solution:

sodium bicarbonate.....2 ounce
calcium chloride.......1 ounce
common salt............1 ounce
water..................16 ounces

Good luck!