If your legend is epoxy based it is likely yellowing during the heat
incursion, and making the white ink look off-white. Check temperature and
time in the solder. The size and thickness of the board and its ability to
absorb heat may also be a factor.

                                                                     Regards

                                                                     Greg
Triggs
----- Original Message -----
From: "Eric Laroche" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, October 02, 2003 7:43 AM
Subject: [TN] Silk screen changing color


> Good morning Techers,
>
> Does any one have an idea why when I pass a particular board in the
> reflow oven the silkscreen changes to an off white colour?  Originally
> the colour is bright white and becomes almost yellow after heat is
> applied to it.
>
>
> Thanks to all,
>
> Eric
>
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