It's either 1FC, SC -1FC or SC no neg. You cannot imbue a weapon with SC and FC and get SC 1FC. If you Imbue 1FC then SC it becomes SC with no Negative. If you Imbue SC first it becomes SC -1FC and then once you imbue FC it will make it SC no Negative.
This is a cool piece and with the 10 DCI you can hit your cap fairly easily...garb, sash, quiver, slither and 10 on your ring (or two pieces with 5 dci). The options are good with this for a few pretty effective hybrid templates. You got a ball park price?