Frank,

Have seen this in SMT processes also...
The silkscreen will go from white to light violet or pinkish at from
210-235C...

The silkscreen appears to be thinner on these PCBs and the occurrence
seems to be high with PCBs from Asia... 

Maybe the white pigmentation in the silkscreen is different or it is
reacting with the soldermask.... 

Paul Edwards
Process Engineering
[log in to unmask]
Tel: 408-433-4700
FAX: 408-433-9988
Surface Art Engineering
81Bonaventura Dr.
San Jose, CA 95134
DUNS: 944740570
CAGE/NCAGE: 1XZ48
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Franklin Asbell
Sent: Thursday, September 08, 2005 10:13 AM
To: [log in to unmask]
Subject: Re: [TN] Pink symbol ink...

That's where my thought was headed until I received more information
from
the customer.

Order qty was 99 pieces. They process in 6 piece lots and 2 of them from
the
most recent lot ran turned that color. The others had no issues.

There are 15 pieces per panel fabricated.

I've left messages at Cookson/Enthone...so if any of you technicians are
viewing this please call and help solve this puzzle.

Franklin

-----Original Message-----
From: Wolfgang E. Erat [mailto:[log in to unmask]]
Sent: Thursday, September 08, 2005 11:54 AM
To: [log in to unmask]
Subject: Re: [TN] Pink symbol ink...

insufficient cure of the ink could do this

Wolfgang

----- Original Message -----
From: "Franklin Asbell" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, September 08, 2005 12:38 PM
Subject: [TN] Pink symbol ink...


> We got a call from a customer expressing an interesting issue.
>
>
>
> They ran product through their wave solder and the symbolization went
from
> white to pink.
>
>
>
> I've never heard of this color change appearing, anyone out there have
an
> idea?
>
>
>
> The symbol is Enthone 50-100R - white, the wave solder info I have is
Type
> R
> flux with a peak temperature of 215 C.
>
>
>
> Appreciate any input, thanks.
>
>
>
> Franklin
>
> pI
>
>
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