My first attempt at a loaf bar. The ends are nice even smooth colours. The more towards the centre, the bars get a darker middle. I tried looking up and something about gelling or gell phase?? I haven't had this with the single bar moulds I usually use. It was a plywood mould with a silicone mould inside. I wrapped it in towels but left it in a cold utility room. Anything I could do to stop this next time?