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Based on GramSlam's excel sheet for 720 rule calculations. Calculated values are rounded to two decimal places.

To use, simply supply values for the first four numbers. The last three numbers will be calculated as you type. You can specify the surface area in either square inches or square feet.

The LCD process is designed for current densities between 3 and 6 amps/ft². The 1:3 acid ratio has been successfully pushed to 12 amps/ft² with aggressive agitation and careful temperature control.

Best dye results are obtained with a thickness between .5 and 1 mil.

Peak voltage is a function of several factors: distance from part to cathode, acid strength, amount of dissolved aluminum in the solution, etc. Yours may vary by several volts without necessarily indicating a problem.