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Thanks, surprising for me as the colours are very different in my books!
...that a lot of books have colours that don't quite match up to specimens actually seen.
So my books all have copious notes in them, now!
Petal/leaf colour is affected by weather, sun, temperature, local availability of nutrients etc, so there is bound to be some variation.
Also the printing process is not exactly infallible!
But this is a good thing, it makes us look more closely at other ID points: also I find (just my opinion) that annotating my reference books makes them "mine".
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Lat/Lng: 51.3346, -0.0197
OS grid ref: TQ380613