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Dry film photoresist and developers

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Adwaittronics

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PCB development using Negative dry film photoresist or using Positive dry film photoresist,which is better quality wise ?
Positive developer is used to resist positive dry film photoresist and Negative developer is used to resist negative dry film photoresist or is it opposite?
Where can I get positive and negative dry film photoresist developers?
If I want to make positive and negative Photoresist developers at home how can I make them? I mean which chemicals are used?
 

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