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Set colors of multiple isosurfaces

I’m looking for advice on how to set the colors of multiple isosurfaces which have been added using .add_trace, i.e.:

import plotly.graph_objects as go
fig = go.Figure()
zone1 = go.Isosurface( ... )
zone2 = go.Isosurface( ... )

So for this example, how would I color zone1 as red, zone2 as blue?

Actually, I figured out a way to do it. I simply inserted a custom monochromatic colorscale into each of the go.Isosurface object creations for zone1 and zone 2, e.g.

zone1 = go.Isosurface(