Surface streaking in bronze patinas is a frequent issue that can detract from the aesthetic appeal of metalwork. The most common causes include uneven application of patina solutions, contamination from oils or fingerprints, inconsistent oxidation due to environmental factors, and improper surface preparation before patination.

To correct streaking, first clean the bronze thoroughly with a degreaser to remove contaminants. Lightly sand the affected areas with fine-grit sandpaper to even out the surface. Reapply the patina solution in controlled, even layers, ensuring consistent exposure to oxidizing agents like ammonia or liver of sulfur. For stubborn streaks, a diluted vinegar or citric acid wash can help balance the patina.

Preventive measures include wearing gloves during handling, working in a stable humidity environment, and pre-treating the bronze with a uniform etch. Regular maintenance with wax or sealant can also preserve the patina’s integrity. By addressing these causes and applying corrective techniques, you can achieve a smooth, streak-free bronze finish.