# Calculate Electro-Etching Parameters

**Disclaimer:**
The following calculations are based on Faraday's Laws and apply to perfect conditions.
However, these calculations are still very useful for estimating parameters such as Average Depth and amount of Material Removed.

These parameters are:

- Metal
- These calculations are based on the pure metal.
However, the numbers for alloys, such as sterling silver, brass, etc., should not be significantly different from the pure metals for small samples such as jewelry.
- Area
- The actual area being etched, not the size of the whole piece.
- Amps
- These calculations depend on a constant current power source being used
- Time
- An accurate time is required.
- Current Density
- The current density (amps / area) is a very useful number for repeating the texture of an etched area.
Commonly the texture of the etched area is smoother with a low current density and becomes rougher with a high current density.
- Average Depth
- The key work here is
**average**.
It is nearly impossible to get a perfectly even etch.
- Material Removed
- The weight of material removed from the anode and either deposited on the cathode, precipitated out into the tank, or remaining in solution.

## Calculate Current Density and Depth from a Previous Etching

## Calculate Amps and Time for a Proposed Etching

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