How can I make the particles in my SKEmitterNode opaque?

Question

I've experimented a lot with the settings in the Particle Emitter editor, but none of them seem to allow me to actually make the particles completely opaque. I've also tried editing it in the actual code:

if let explosion = SKEmitterNode(fileNamed: "ToothExplosion") {
            explosion.particleColor = SKColor.whiteColor()
            explosion.particleColorBlendFactor = 1.0;
            explosion.particleColorSequence = nil;
            explosion.position = contactPoint
            addChild(explosion)
        }

Answer 1

Did you change the Particle Texture?

Try to put (in your sks file, ToothExplosion.sks) a solid circle, spark is not opaque: