Merino/Silk/Bamboo Weft Yarn

Hej, depending on the amount of bamboo, you can just use the usual acid dye for it. Bamboo takes on the dye rather difficult, in my experience, but usually it is so well carded in the protein fibres, that it doesn't really matter. And the mix sounds more like a lots of merino, some silk and a little bit of bamboo, so just go ahead and use your favourite acid dye ;o) Or use plant dye. I've had wonderful dyed cellulose/protein yarn (sock yarn with up to 35% linen, cotton, ramie or bamboo) with madder, brazil wood and indigo. The usual 10-15% alum mordant, leave the yarn in for about 2 days after heating for an hour to simmer, and then just dye. When using indigo, you don't need to mordant it beforehand, of course, but you can mordant it afterwards, if you want variegated yarn with other plant dyes or if you're up for more purple.

Anther option are Procion dyes. Depending on how much Merino is in the yarn (if my above estimate is not correct *g*) you can ignore the merino part and just dye like usual with soda.

Usually, mixed yarns are not that complicated, it all depends on which kind of fibre predominates. You can treat silk like a go between, since it usually dyes well with both kinds of dye.

Ulrike