This is a very stupid question, but how do I spawn a potion effect particle in a world with a custom color?

I'm using

world.spawnParticle(EnumParticleTypes.SPELL_MOB, x, y, z, 0.0D, yVel, 0.0D);

to spawn the particle but don't know how to set the color. I understand its got to do with the last optional parameter, but don't know what I'm supposed to enter to get it to work.

 

Secondly what is the most efficient way of creating a block that spans three blocks vertically? I need to be able to interact with the blocks above the initially placed block and for it to open the tile entity associated with that block.

Secondly what is the most efficient way of creating a block that spans three blocks vertically? I need to be able to interact with the blocks above the initially placed block and for it to open the tile entity associated with that block.

 

First, don't make a thread about two unrelated topics.

 

Second, you can't.  You must use more than one block.