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HowTo: How to photo etch a PCB
( Russell Watson)
Step 7 : Developing the board
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| | Mix developer: 1 part developer to ten parts water. I used 50ml developer to 500ml water (THIS COULD BE DIFFERENT IF USING OTHER BRAND OF DEVELOPER). It is better to mix a weaker than stronger developer. Mix this before hand. Place board into developer solution, take a foamy brush and lightly brush the photo resist off for 1-2 min. You will very quickly see the green photo resist coming off. I think my board was in there for only 30 - 60 seconds, so watch closely because my board was not in there for 1-2 min. If left in there for too long, all the photo resist will come off. Next time, my solution will be weaker. Place board directly into water to naturalize the developing stage. Take a close look at the board to see if you need to touch up anything with a permanent marker. (I did not need to).
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