Weekend Wonderings: Does “safe for colour treated hair” mean anything?

In September’s Q&A on Patreon, Doris asked: Does “safe for color-treated hair” on shampoos have any real meaning?  Are there any common surfactants or other ingredients we might use that would not be safe for color-treated hair?  I assume by “safe” they mean the ingredients are less likely to fade or change the color (or…

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