I did a spray tan on Thursday afternoon for a very pale client who said she wanted to be dark. We use sienna X mainly 8% and 10% so I used the 10% on her and told her she should wash it off in 8 hours, just before bed. Get a call on Friday morning saying it hasn't developed at all but she hasn't showered yet (at which point I thought why are you calling then?!). Is it possible for it to not develop or was she maybe being awkward because she hadn't showered yet? This has never happened before.