The product turns blue when it comes into contact with copper. If there is no blue present then the cleaning is complete and any copper has been removed from the barrel.
ID 8757171
Home & store delivery
Available
Pick up today at Decathlon
2-year warranty
365 days to return for members
Features
Design benefits
visual efficiency
Turns blue in the presence of copper.
easy maintenance
Apply using a nylon brush. Wait 5 minutes then dry off.