I've started the sleeve using one strand of the body yarn together with the soft white cashmere I have. It is not ideal though the effect varies according to the angle and the light. But I don't have enough of anything to knit the whole cardigan - the cables really eat yarn! And I am housebound and not fashion conscious so no one much sees me. And I badly need a warm cardigan. So this seems the best fo some not very good options. I do find that once the oil is washed out and the yarn has been washed a few times the colour generally softens a good deal - which would be a good thing in this case - fingers crossed!