Crafts (art): I have a piece of silk fabric printed in bright jeweltone blocks of color, but the dyes were not colorfast and have run and spotted in an ugly way. Can it be salvaged in any way?

There are a couple of things that might be going on here. The simplest explanation for your problem is that the fabric was not fully rinsed after dying.  During the dye process, some dye particles stick to the fabric, forming a chemical bond.  These dye particles give the fabric its colour, and they stick more or less forever.  Any other dye particles that don't adhere are excess.  The excess ones should be rinsed away until the water runs clear.  You can go ahead and rinse your silk in successive batches of cold water until the water runs clear.  Silk has been washed in water for hundreds if not thousands of years, and it is just fine.  There is a special soap called Synthrapol that can help speed this up a little; it's very good at picking up loose dye particles.  But it is just a time-consuming and water-intensive process, and many manufacturers cannot afford to rinse out every last remaining dye particle. Another, less likely, problem might be that a poor dye was used in the first place, or the process was poorly done.  There are two main dye groups.  One for protein fibres like wool and silk which use a hot water and acid process.  Procion H is one example.  Another set of dyes work on cellulose- based fibres like cotton, rayon, and linen, and use a cold-water process.  Procion MX is the world-standard.  These are quite easy to use, very popular with hobbyists.  Procion MX can also be used on silk but an acid has to be added, and the cloth has to be heated or steamed with an iron.  It would be difficult to do anything now to correct poor practices in the dying process.  You can add a little vinegar to the rinse water, but this might have the effect of sticking some of the previously un-stuck dye particles, perhaps in places you don't want them. Your best bet is to rinse and keep rinsing until the water runs clear.  Avoid heat until the excess dye is removed.  I highly recommend Synthapol if you can get it easily.  Then iron on the Silk setting with steam.  Silk can take lots of heat, but it's the steam that will remove wrinkles.  The steam might help to set the dye, if that was part of the problem. See also:  Colour shift in Silk dying:  http://www.jacquardproducts.com/forums/discussion/3994/color-shift-in-silk-procion-mx/p1