For example I would like to make my images layer Green and my copy layer Red in my layers palette.
If you have a doc open then you can do this… It will look for a layer by name but you can change that to index or whatever…
#target illustrator
var doc = app.activeDocument;
var lay, layCol;
try {
lay = doc.layers.getByName( 'Copy' );
layCol = new RGBColor();
layCol.red = 255;
layCol.green = 0;
layCol.blue = 255;
lay.color = layCol
} catch (e) {};
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