I’m all for using the layer blending options for funky creative images, but in certain situations you have to be carefull which you use to avoid unpredictable shifts in colour.
Drop shadows can print very badly if you don’t use the multiply blending mode, particularly if it is sitting on a highly saturated background. If you leave this on normal this can look ok on your monitor, but when printed can make your drop shadow look very washed out, grey and nasty.
When using lighter outer glow type effects, the screen layer blending mode usually works well. Sometimes experimenting with different blending modes for outer glows can create some very cool effects, especially on multi-toned backgrounds when certain areas of the glow can become very intense!
One thing is for certain though, always avoid the default normal blending mode for these kind of effects, it just looks nasty and this effect is often exaggerated by lytho and screen print processes.
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