3 steps building your solar cell part 2

Step 2.
the surface of the cell must be made ex
tremely clean. Prepare a solution of nitric acid by carefully mixing 20 parts nitric acid and 80 parts distilled water. Remember towear pro-tective goggles or other suitable eye protection and to work in a well
ventilated area when-ever you work with chemicals.
Copper disk, scoured & polished
and dipped in acid.

IMPORTANT! ALWAYS ADD ACID TO WATER! NEVER ADD WATER TO ACID!
Begin by carefully polishing the face of the cell with a fine grade of steel wool until it shines brightly. Then place the cell with the shiny side up, in the solution of nitric acid.
Soon, tiny bubbles will form on the copper disk. Stir the solution occasionally. When the disk seems shiny and well cleaned, remove and rinse it under cool running water.
WARNING! Never to allow your skin to touch the acid, and that no acid remains on the cell.
The cell will sometimes work without the acid cleaning if it is simply well polished by the steel wool. However, we strongly recommend the acid cleaning.
Nitric acid and the other chemicals mentioned in the text can be easily ordered from a number of mail-order chemical houses such as found in the classified section of magazines such as Popular Science.


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