Thank you Chris !
You got the big award.
Book says Chlorophyll could be coated to the dry emulsion plates for few seconds.
I think this open the gates because it is difficult to process liquid emulsion at full dark and if I can do it to sprayed dried emulsion , everything becomes easier.
Be sure , chlorophyll is one of the widest researched substance and you can find it from local university , biological medical distributor , lab or Sigma.
May be excessive amount of yellow comes from this formula at some autochromes.
May be Ron gives more detail.