For Yama Merino Linen, Merino Mohair and Merino Nylon blends (superwash):
Garments can be machine washed on a cool, gentle cycle however I recommend hand washing.
Always soak in cool to lukewarm water (very hot water could activate the dye and cause bleeding).
Soak in a wool wash and rinse in clean water (I like to add a drop of essential oil).
Roll in a towel and squeeze most of the water out.
Block to size or shape, dry lying flat (I don't block my knits aggressively - but this is a personal choice).
Very dark colours colours can give off some colour on your hands while working with it ~ this is called "crocking". To reduce crocking, yarn can be soaked in lukewarm (not boiling) and dried before winding into a ball to work with it.
I found some very good information on Anna from the Dunkelgrun podcast's website:
"It can also occur with acid dyed yarns, especially with very dark or saturated colors, that not all of the dye molecules get chemically fixed to the fiber. Even if the dyer washes the yarn carefully until the water is clear, it can still happen that color stains on your hands while you are knitting or bleeds in the washing water.
This is very likely happening because during the handling, winding or knitting different areas of the yarn are coming to the surface, which might not have been exposed to the washing water before and thus dye will come off. This is not the dyers fault at all, it is also not harmful in most cases and after several washes the bleeding is going to stop. Crocking or bleeding can be a problem if you would like to combine very saturated handdyed yarn with a light color in one project, because the color can bleed and stain your light yarn. If you are planning to do this I recommend you to wash the saturated color several times before you knit it up, maybe reskein it in between. That way you can make sure that all the areas are exposed to the surface and to the wash water."
Source: https://dunkelgrun.com/fiber-science-1/
For Yama Falklands Merino Silk, Yama DK Luxe and KidSilk (contain some untreated fibres)
Gentle hand rinse in cool water - do not agitate, these yarns can felt.
Soak in a wool wash and rinse in clean water with a drop of essential oil.
Roll in a towel and gently squeeze most of the water out.
Block to size or shape, dry lying flat. (I never block my knits aggressively - but this is a personal choice).