Surface Preparation—Remove all surface blemishes
from all six sides of the strip obtained from a previous analysis.
One way to accomplish this is to use 00 grade or finer steel
wool or silicon carbide paper or cloth of such degrees of
fineness as are needed to accomplish the desired results
efficiently. Finish with 65-μm grade (220-grit CAMI-grade or
P220 FEPA-grade) silicon carbide paper or cloth, removing all
marks that could have been made by other grades of paper used
previously. Ensure the prepared copper strip is protected from
oxidation prior to final preparation, such as by immersing the
strip in wash solvent from which it can be withdrawn immediately
for finish preparation (polishing) or in which it can be
stored for future use.