|Ferric Chloride Etching Solution|
|These notes are based on a Non-Toxic Printmaking Workshop that was provided by Elizabeth Dove in July of 1998 at the University of South Dakota, Vermillion.|
|Annie Gregg etching a copper plate in ferric chloride/Edinburgh etch solution. Using a needle tool she has drawn through a dried hard ground coating of Future Acrylic Floor Coating Solution and has bitten the exposed line work for 10 minutes. Contact paper protects the back of the roofing copper plate and a folded length of wide plastic tape is adherred to the plate's back as means of suspending the plate in and moving the plate to and from the etching solution.|
A. General Ferric Chloride Information
B. Plate Preparation
3. Etch a test plate to establish times for gray scale and line widths. Perhaps begin with 2 - 3 minute intervals.
4. When finished with a timed etching session, remove the plate and thoroughly rinse both sides of the plate and tape with water.
5. Rinse plates completely after session in ferric chloride. Take care not to get on clothing since it makes evident and permanent stains on materials and eventually skin if left on for a long enough period.
6. If any material is to be applied and/or attached to the plate, it must be deoxidized.
7. Use an alkali solution such as caustic soda or an ammonia solution to remove screen filler from the plate.
8. Sodium Carbonate (soda ash) neutralizes ferric chloride.
9. Don't suspend plates by their tape tails using devices having any metal in them. Use only plastic or all wood clothespins.