Admixture school and Burning Hands

[Dawiz]

Not every instantaneous spell have effects that last after the spell itself resolves, but Burning Hands does. Can I suppose that an admixture wizard changing the [fire] energy in [cold] could extinguish a little 2x2squares fire as soon as it manifests?

[Avianfoo]

Up to your GM. Changing the energy type will remove the "burn" from burning hands. But whether it adds another effect (if any) is up to your GM. It is generally a given that cold damage extinguishes flames (in the 15ft cone that is the affected area of the spell).