All other SM's were silver except Apollo 6. I'm wondering what the justification for this was, if any?

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    $\begingroup$ Possibly just for aesthetics! Wikipedia says “the SM was painted white to match the Command Module's appearance,” but it’s unclear what the source for that is. en.wikipedia.org/wiki/Apollo_Command/… $\endgroup$ – Russell Borogove Jun 1 '18 at 21:14
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    $\begingroup$ It may have been part of the reassembly between the SM and CM. The CM of CSM-14 was disassembled as part of the investigation for the Apollo 1 fire, and the SM was later reassembled with a different CM for Apollo 6 (After that SM was destroyed in an explosion!) $\endgroup$ – Josh King Jun 1 '18 at 22:29
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    $\begingroup$ @Sean - I was wrong. The change came before block II. Apollo 6 SM was older (014) than Apollo 4 SM (017) because SM 020 was destroyed as noted above so Apollo 6 used the Apollo 1 SM. $\endgroup$ – amI Nov 22 '18 at 5:43
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    $\begingroup$ @aml what happened to SM 020? $\endgroup$ – Justin Braun Dec 23 '18 at 18:36
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    $\begingroup$ One section of the Wikipedia article mentioned above had errors; I've updated it with correct info for CMs and SMs -014, -017, and -020. $\endgroup$ – Alex Hajnal Dec 25 '18 at 4:41

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