Most maskants are photopositive materials and are designed to operate at low pH and to be developed in high pH solvents. |
At higher temperatures D. pseudoobscura, D. simulans, and D. melanogaster become more photopositive, while D. ananassae and D. willistoni become less photopositive. |
In this process, photonegative materials will be removed while photopositive materials remain in the final device. |