I'm in the same position, not yet gotten my feet wet in Gum printing, and
was interested in the Kit mentioned. I contacted the Formulary regarding
what is included to see if it was a value. This was their reply:
Contents of Gum Dichromate Kit:
300ml Liquid Gum Arabic
27g Ammonium Dichromate
1 tube Lamp Black watercolor pigment
and instructions.
I think if I do it, I'd like to make more/larger prints than the kit
allows. I've already been collecting watercolors I like. Though it will
cost more, I think I will buy a pound of Potassium Dichromate for $15.95
(454g) (100g cost 7.95) more than 16 times the amount in the kit. The
liquid Gum arabic is expensive, 1 pint of 14 Baume is $14.19. From the
many posts I've learned a gallon of liguid gum arabic used for
lithography costs about $19. Don't forget your paper and Gelatin.
The kit doesn't address the Sodium (or Potassium) (meta)Bisulfate
solution used in clearing, or the gelatin hardner I've heard debated upon.
I want to do 12x12 inch prints from litho negatives (Dektol), in multiple
color.
I hope I've covered everything.
Macy Garcia