A practical test before changing hair color

[Emmadog]

I am preparing a remote consultation for a new hair-color client because the client cannot visit the salon until the day we perform an in-person strand test. I need notes that remain useful when we later compare real swatches. My concern is that her phone camera looks warm while the reference photographs she sent were taken under several kinds of indoor lighting. I do not want to diagnose an exact season remotely, but I would like the conversation to narrow down sensible shade families before the appointment. I am using this online color analysis to prepare a short list of possibilities for the strand test. Would matching one simple daylight setup improve the comparison, and is it worth comparing the same image on two devices during the call? The consultation will also cover color history and upkeep. I would appreciate a cautious checklist from stylists who consult online.