Check the phone's display preference before deciding that a page has changed its colour legend. Keep the written label separate from the colour you perceive; the two are not interchangeable evidence.
Note the inversion setting
Android Colour inversion affects the display, including media. Look under Settings, Accessibility, Colour and motion, Colour inversion; device menus can differ. The documented scope is in Google's accessibility display help.
Note whether inversion is on before making any comparison. Do not permanently remove an accessibility aid you rely on. If a temporary change is appropriate for you, keep track of the preference you intend to restore. Use a fixed, read-only passage so that changing page content does not complicate the comparison.
Work through a labelled example
Imagine a hypothetical legend containing the text labels “Red” and “Blue”, each beside a swatch. The first swatch does not look like the red you expect. Write down two observations: the label still reads “Red”; the swatch looks unfamiliar under the current preference. Do not rename the label “Blue” merely from its appearance.
After restoring a known display preference, compare the same static paragraph and its background, then return to the same legend. If the appearance differs while the labels remain the same, keep that distinction in the record. You have observed a presentation difference, not demonstrated that the author changed the meaning of the legend.
Do not infer unseen colours
If only an unclear screenshot is available, write what can actually be read from it. Do not assume how an unknown screenshot process handled the phone's display filter. An image of a screen and your direct view are different observations until you have checked their relationship.
The useful output is specific: “Written label confirmed; appearance affected by a display preference; original colour not independently checked.” That is more informative than guessing a colour or treating the display as a prediction. Our unclear-colour reading checklist provides broader context, not a rule for future results.