FRER have never let me down, and I must have done hundreds! I see a line on the FR but I know just how hard the early lines are to photograph. It looks a bit white. Did it dry darker? Mine always did.
If there's a line with color then yes I'd say its the start. This happened to me, I could see a pink line but for the life of me I couldn't get it to show on a picture! Then the next day it was loads clearer
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