I'm making fireworks effect along with a tutorial that uses CC Particle World...
but in the tutorial when they duplicate the layer they have multiple fireworks happening on screen at the same time, the way you would expect with a transparent adjustment layer.
When I do it one layer of the fireworks blocks the underlying one, WHY???
Why is an effect on a transparent layer not actually transparent?
It's blend modes.
If you are using multiple instances of particle world on the same layer then all the lower instances in the effect stack need to set to "composite with original" in the Extras section of the menu.
If you are duplicating the solid layer the effect is applied to in the layer panel then you need to set the blend mode of the layer above to overlay or add or multiply or one that works for you.
What did you end up doing? Let us know so that we can let others know, as well.