Uncertain or mixed undertone
Many people find undertone genuinely hard to pin down, especially without controlled lighting, and that uncertainty is not a failure to look hard enough — it reflects real ambiguity in a subjective judgement.
Why informal tests aren’t reliable
Inconsistent results across different informal tests are themselves evidence of how weak these tests are, not evidence that something is wrong with the person taking them.
Camera white balance and screen calibration both shift how skin looks in a photo — a phone photo taken under warm indoor light can look distinctly warmer than the same skin looks in daylight, and vice versa.
The most reliable practical approach
Skip trying to name an undertone at all, and instead directly compare specific colours or metals against the skin in daylight — the practical decision doesn't require the label.
Directions that often work
Direct comparison, not category membership, is the most reliable practical guide.
Colours to compare carefully
None specifically — the comparison approach applies to any colour under consideration.