Welding simulation

Over 10 years ago I made welding simulation in Blender 2.4x
Here is the video:

Now I am trying to recreate in current version but I can’t.
Here is the new file:
The problem is - all particles do change color at the same time but I need them to change color after each one is created.
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Nice! How did you make the joint/seam? :slight_smile: