<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Niels,<div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>The initial model colors are defined in chimerax.atomic.colors as a list named atomic_color_names. That list is:</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>["tan", "sky blue", "plum", "light green", "salmon", "light gray", "deep pink", "gold", "dodger blue", "purple"]</div><div class=""><br class=""></div><div class="">You can use Python code to replace that list. I have attached a Python file (start_colors.py) that replaces that list with ["khaki", "purple", "dodger blue"]. You could obviously edit the code to put in any color list you want. Then you could put "open start_colors.py" in the list of commands that ChimeraX executes at startup (under Preferences/SettingsāStartup) to have them always apply. Just so you know, if you have N colors in the list, then the first N model IDs will get those colors. For models with IDs higher than that, ChimeraX will try to use a color that contrasts with the colors in the list, the background color, and the selection-outline color (green).</div><div class=""><br class=""></div><div class=""><div class="">--Eric</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Eric Pettersen</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>UCSF Computer Graphics Lab</div></div><div class=""><br class=""></div><div class=""></div></body></html>