If you are looking to "develop" your own paper chemicals from scratch, you can use common household items or traditional chemical formulas: Make Your Own Paper Developer
: A weak acid that immediately halts the action of the developer to prevent over-development. Time : Approximately 30 seconds.
: 10 minutes for RC paper; up to 60 minutes for FB paper. Homemade Developer Recipes (DIY)
: Converts the light-exposed silver salts on the paper into a visible image. Common developers include ILFORD Multigrade or Kodak Dektol .