Hello Franko!
I still did not try the Retr0Bright recipe (but I will this spring with a Commodore VIC-20), but I managed to get good results with water peroxide only (8% if not wrong) BUT with sunlight (during a summer afternoon, here in northern Italy...
)... with what? A key for a C-64C keyboard!
So UV is the key to make the reaction run! (energy itself)
BY!
