Silver chloride or potassium bromide

My wanna be hobby is photographic emulsions on canvas.I'm interested in jet black prints. Somewhere I read using metcuric chloride and pemangante i believe produced blacks better than platinum prints.im sit up to make any emulsion chloride or bromide.using you tube i can produce these chemicals. I'm not into into contrasts or gradation.just limiting my blacks to 5 zones .i play with growing crystals and most are old time blue sensitive. I do usr erythrosine or eosine for green.reds go black so its cool I know this knowledge is limited as now it gradation now days .looking for suggestions or information from those who may offer some help