I would say a week is too long and that the seed is likely a dud. I would try a direct to solo germination and see if something pops and go from there. I've had some weird colored seeds do just fine.
Ok, so I said a week in distilled water, but actually I do a 24 hour soak in water, then into medium. I had it in rockwool, but then yesterday I got curious and took a peek, and nothing. So back into just water and now here we are.