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 Post subject: RIT dye issue
PostPosted: Sat Jun 28, 2014 5:03 pm 
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Joined: Sun Oct 30, 2005 1:30 pm
Location: bay area, california
I've done a fair bit of RIT dyeing in the past, but recent lots I've had this issue come up.

Dyeing shapeways WSF-Polished with a strong concentration of Black RIT powdered dye (with some vinegar in a large amount of water).
The pieces got really good saturated black, but upon drying, I see blotches of bright white. The blotches seem to temporarily go away when wet, but come back on drying...

Attachment:
rit.jpg
rit.jpg [ 1.43 MiB | Viewed 220 times ]


Any ideas on what is going on and potential solutions?

-Derek


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 Post subject: Re: RIT dye issue
PostPosted: Sun Jun 29, 2014 2:48 pm 
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Joined: Fri Feb 18, 2000 8:50 am
Location: chicago, IL area U.S.A
Some kind of contamination? Maybe oil?? Maybe try washing in soapy water, and give it a really good rinse and try again.

-d


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 Post subject: Re: RIT dye issue
PostPosted: Mon Jun 30, 2014 2:45 am 
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Joined: Sun Mar 15, 2009 12:00 am
Location: Jarrow, England
It sure looks like something has dripped onto the surface and soaked into the nylon. Perhaps this happened at Shapeways? Is it WSF polished? Have you done anything to the part e.g. sanding, which might have caused this?

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 Post subject: Re: RIT dye issue
PostPosted: Mon Jun 30, 2014 11:04 am 
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Joined: Sun Oct 30, 2005 1:30 pm
Location: bay area, california
these are polished WSF. nothing extra done on my end. I agree it looks like some contamination or residue,
and from experiments this weekend, I was able to scrub a lot of the white gunk off (without removing the dyed sections). They are still soaking/rinsing in case that helps. I haven't tried fully washing them in soapy water - that I guess is next :)

-Derek


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