I understand why the cobalt-60 decay experiment shows that parity is violated in the weak interaction.
However, my lecture notes also say that 'Note that the outcomes of this experiment can also be interpreted as a violation of charge conjugation invariance and that the combination of parity and charge conjugation is still obeyed in this experiment'.
How can one say charge conjugation is violated too from this experiment, if there were no anti-cobalt-60 nuclei or positron tests being done?
My only thoughts are that if you postulate that CP is always conserved, then C must always be violated whenever P is, so the fact that you have measured P violated here means you expect C to be violated here too (eventhough you can't see that from the experiment directly). I know that in reality only CPT is conserved, but maybe this is all they mean?