Can any of the more chemically inclined folks on here help me understand how varying the ratio of Pot bromide and Pot Ferri will affect the darkness/lightness/coolness/warmness/browness/yellowness of sulfer-based sepia toner?

For example, will a 1 part pot bromide to 1 part pot ferri ratio yield more yellow or darker brown than say, 1 part pot bromide to 2 parts pot ferri?

I am intentionally excluding all other variables such as bleach dilution and time, paper type. I know those variables effect color as well but I would like info on just this variable right now.

That said, I would also be interested to know how the amount of sodium sulfide used in the solution, affects coloring.

Appreciate any info!

Cheers,
Phil