Is it the Debbie Bliss Alpaca Silk or the Alpaca Silk DK?
Cause, according to the Debbie Bliss site and this weight chart (http://knitting.about.com/od/yarn/a/yarnweight.htm) it would be considered a medium/worsted weight for the regular silk. The DK would be slightly thinner/lighter weighted. And if you're talking about another different Alpaca Silk altogether, then I don't know :P
You could probably get away with it. Maybe if you knit the main color with the lilac and the contrasting color with the black? To get the weights correct.
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Cause, according to the Debbie Bliss site and this weight chart (http://knitting.about.com/od/yarn/a/yarnweight.htm) it would be considered a medium/worsted weight for the regular silk. The DK would be slightly thinner/lighter weighted. And if you're talking about another different Alpaca Silk altogether, then I don't know :P
You could probably get away with it. Maybe if you knit the main color with the lilac and the contrasting color with the black? To get the weights correct.