Chemical Measurements: A General Post

Since we now buy most of our chemicals in bulk powder form, this post is a general reminder for everyone (mostly myself) on how much powder to mix into how much water to make our paper developer. Please note that we have a small digital scale in the darkroom now which will make it easy to mix powder in the small quantities that we need so that we don’t end up mixing entire envelopes of this stuff all at once. We don’t have large enough containers to store them, after all. If you need to heat up water, use the electric kettle that’s in there as well; you can insert the thermometer to measure temperature into it through the spout.

To make 1 LITER of the stock paper developer solution:

  • Take 3/4 L (750 ML) of water at 100º-120ºF (use kettle)
  • Add 54 g of the Kodak Selectol Soft Developer (use scale and dry plastic beaker)
  • Stir until the powder is completely dissolved
  • Stir in another 1/4 L (250ml) of cold water

It’s usually good to go right there and then. The stock solution is still concentrated and needs to be diluted at a ratio of 1:1 prior to use in the darkroom for paper processing. Happy printing!


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