If still looking for an "uncolored" power cord for your H390, consider a Shunyata Alpha EF v1 (no conditioning, all copper/no silver). Should be in your price range. I'm using one on my H390. Uncolored? Kind of a Zen question...hard for me to answer for you (or for myself, for that matter).
The Alpha NR I have did take some time to break in...lose the edge, open up and gain some body. Don't recall that being the case with the used Alpha EF, however patience to allow a good amount of time for settling in is always advisable.