Electronics Forum | Tue Oct 19 19:44:19 EDT 2010 | laen
I'm looking to mix up a batch of purple solder mask. Has anyone found a good ratio of red and blue that produces a pleasing purple? 50/50 produces a pretty ugly grape color. Is there a standard ratio most fabs use?
Electronics Forum | Wed Sep 08 05:17:04 EDT 2010 | eddtsk
Hi, ran across a batch of PCB that has white silkscreen during receiving but turns purple/pink after our reflow process. SEM/EDX test can show there is no significant different element between the white and purple silkscreen. Can any help advice what
Electronics Forum | Thu Sep 09 13:25:22 EDT 2010 | eezday
I've seen the purple silkscreen before on ENIG board built with PbSn process. I would think that if temp is the issue the lower process temp would not have caused the purple ink. I remember that the flux I used was water soluble and I attributed th
Electronics Forum | Wed Sep 08 20:14:27 EDT 2010 | eddtsk
Hi Davef, ues, its ENIG. But do you know what the causes this? We send the board for testing but finds nothing defferent chemically between the white and the purple silkscreen. The supplier claim that its our process that is caused the changes.
Electronics Forum | Thu Oct 21 23:20:05 EDT 2010 | camtechpcb
According to the Trichromatism.Half red and half blue will get purple.But the trichromatism only apply to color light. The red and blue soder mask are coloring material.Both of them absorb light.You mixed them up,so you lose blue and red,and get grap
Electronics Forum | Wed May 30 10:09:39 EDT 2012 | brettrenishaw
Recently we have noticed a purple-blue colour film on the surface of the molten solder. It can be cleared when de-drossing the pot. The pot will normally go a yellow/gold colour before it turns purple-blue. Is this most likely an oxide of the tin or
Electronics Forum | Wed Sep 04 08:53:27 EDT 2002 | dphilbrick
Thanks Dave
Electronics Forum | Fri Sep 14 17:22:54 EDT 2007 | golff
I have a changed on the white silkscreen to pink or purple. Do anyone come across with these problem before?
Electronics Forum | Tue Nov 15 21:06:04 EST 2005 | davef
Is your IMC purple? [The sure way to tell if you have the 'purple plague'.] Where does the failure occur? * At pad / wire bond * Up wire from the bond Tell us about the aluminum pad. * What is the plating specification? Is that what you actually r
Electronics Forum | Sat Mar 04 13:26:41 EST 2006 | jldowsey
Something unusual happened yesterday, we reflow soldered two boards with white silkscreen legend, and they came out of the oven with purple silkscreen legend. Not tan or brown from overheating, but purple. The boards were reflowed on their normal pr
