Resolved Visual effects graph, Goo example, can't change color.

Hi there. I have been trying to repurpose the visual effects graph from this unity example. I want to change the colour of the slime but have been unable to do so. I have changed the color of the decals but can't figure out how to change the particles. every reference to color in the graph seems to have no effect on the slime color. If anyone could has any ideas it would be much appreciated, thanks.

 

Finaly managed to figure out what it was. You need to go to Edit > Preferences > Visual Effects > check 'Expose experimental operators/ blocks' - This exposes the shader graph which is being used in the block which was invisible before and lo and behold its color is green! so you can expose that value now and change it to anything you want.