Corrosion inhibitor of NiCu for high performance writers

A process for doing photo re-work during manufacture of a write-head for a magnetic disk system, comprising:

• providing a lower pole piece;
• depositing a layer of gap material on the lower pole piece;
• depositing and patterning a first layer of photoresist on the layer of gap material, thereby forming a first frame;
• within said first frame, forming a step layer of a non-magnetic material that includes copper;
• removing said first layer of photoresist;
• depositing and exposing a second layer of photoresist on the step layer;
• providing a developing solution for the photoresist;
• modifying said developing solution by adding to it a quantity of BTA;
• using the modified solution, developing the second layer of photoresist, whereby any copper in the step layer that comes into contact with the modified developing solution is unaffected by the development process, thereby forming a second frame.
• within said second frame, forming an upper pole piece layer;
• and
• removing said second layer of photoresist.