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There are some limitations :
1 ) You must to check PCB manufacturer process corrosion limitations ( generally 6mils )
2 ) It is affected by Voltage and Frequency applyed to the tracks.
Your reply is more apt Mr Arun. Generally as many members wont go for production and would try homebrew, perhaps the op expects an optimum track width for toner transfer method.
Most manufacturers make 6 mils trace width and spacing without additional costs. 4 mils is often required for high density circuits and can be managed by most PCB suppliers at a surcharge. Absolute minimum trace width is 2 to 3 mils these days.
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