Troubleshooting Blackening
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Troubleshooting Blackening Solution
1. Issue: Rainbow colors on the item after dipping
1.1 The solution may be too diluted. Adjust the concentration to 20-30% blackening solution with the rest being clean water.
1.2 The dipping time may be too short. Extend the dipping time until a consistent black patina is achieved.
1.3 The water used for mixing might not be clean enough. Use clean or distilled water to prolong the solution's life.
2. Issue: Gray color on the item after dipping
2.1 The solution may be too diluted. Adjust the concentration to 20-30% blackening solution with the rest being clean water.
2.2 The dipping time may be too short. Extend the dipping time until a consistent black patina is achieved.
2.3 The solution might be dirty and contaminated. Prepare a fresh batch of the solution.
3. Issue: Longer time required for blackening
3.1 The solution may be deteriorating. Add more blackening solution or replace it with a fresh batch if adding more does not resolve the issue.
3.2 The solution might be dirty and contaminated. Prepare a fresh batch of the solution.
3.3 The solution may be too diluted. Adjust the concentration to 20-30% blackening solution with the rest being clean water.
4. Issue: Blackening layer easily peels off or does not adhere
4.1 Ensure that the item is thoroughly rinsed and free from any residue or oil.
4.2 The solution may be dirty and contaminated. Prepare a fresh batch of the solution.
Mixing Instructions
Blackening Solution: 20-30%
Clean Water or Distilled Water: 70-80%
Solution Control
If the blackening process takes longer, add 20% more blackening solution.
Working Procedure
Clean the brass or copper item thoroughly.
Dip the item into the blackening solution until the desired color is achieved.
Rinse with clean water.
Dry the item by blowing or baking.
Polish or buff the item to achieve a shine.
Recommendations
Avoid over-dipping the item to prevent excessive oxide film formation that can result in a black residue on hands. Reduce dipping time if necessary.