Circuit board characters (silk screen) min height least ≥ 0.1 mm, min width least ≥ 0.15 mm. otherwise the result is often blurred.
Default, all silkscreen layer will be processing. Please remove the extra characters and describe. If possible, try to remov unwanted silkscreen layer file.
* For DiGPCB's PCB board manufacture. Both side silkscreen is no additional cost.
Do not use silkscreen layer to defined any slot,outline layer or annular sign(annular mark). The right way is that you can use mechanical layer & keepOut layer (protel software), or add an new layer to define.