With
the Cyanotype, the combination of chemicals can be varied to produce
different effects -
| a greater proportion of solution A - Ammonium Citrate of Iron or Ammonium Ferric Citrate increases the sensitivity and consequently less
exposure time |
 |
| a greater proportion
of solution B - Potassium Ferricyanide produces a deeper blue |
 |
| Contrast
can be increased by adding potassium dichromate. six drops per 2 millimeters
working strength emulsion. |
 |
