To use take one part
A and add four parts water.Then take one part B and add four parts water. Then
mix the diluted parts A and B to make the working solution. Immerse prints for
between 4 and 8 minutes. Then wash. The next step is to immerse the print in a
solution of hydrochloric acid ( one part in fifty parts of water ) for two minutes.
Finally wash again for thirty minutes.