Neither via Tulip editor nor programmatically
can I change the color of edge. The only case when color gets changed I found is when I change color of neighbour nodes.
By default the color of edges are interpolated. (The rendering engine use the color of the source and target of the edge).
In your case you must deactivate the edge color interpolation mode (you should also have a look to size interpolation mode if you want to play with edge size).
Thank you so much for prompt reply. It worked out perfectly.
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