Wow, thanks everyone for your replies! Edward & Sebastian: it's possible that the molds may have been dusty. I keep them in storage boxes but I did not wipe them before using them. Will remember to do that next time. Kerry: thanks for the welcome, and there's no color added to the molds - I wish!! ;-). Adding color will likely be my next series of questions for you all. I'm learning that chocolate is far more complex than I previously thought, but that said, challenge accepted!! (Something tells me this will be a steep but delicious learning curve). Glad I have you folks at eG as a resource!!