Just a shot in the dark, but any chemistry majors in here?

Here is a new problem that popped up-

We bond some heat generating components to a pcb using loctite 384.  That is
a thermally conductive adhesive.  After the bonding is cured, the parts are
hand soldered (SMT).  We use water soluble (Kester 2331-ZX flux) and 63-37
alloy solder.  The PCB finish is ImAg.  What resulted was a BRIGHT blue
liquid residue.  Bright blue like the color of blue cotton candy or blue
raspberry candy.  It appears to be water soluble (visibly removed with DI
water, not sure about ionically)

I am thinking this has to be some chemical Rx, so I mixed a little adhesive
and flux in a beaker, but no color, even with a little heat.  Could it be
from chemicals in the PCB finish?  We use this same combo of materials very
regularly and have never observed this phenomenon before.  All materials
within shelf life.

Per the MSDS for the adhesive:
Alumina trihydrate:                    60-100%
Tetrahyrofurfuryl methacrylate:    10-30%
Hydroxyalkyl methacrylate:        5-10%
Cumene Hydroperoxide:            1-5%
Saccharin:                                1-5%
Ethylene Glycol:                        0.1-1%

Per the MSDS for the adhesive activator
n-Heptane:                                30-60%
Aldehyde-amine condensate:    10-30%
Isopropyl Alcohol:                    10-30%
3-ethyl-2-propylquinoline:            1-5%

Per the MSDS for the flux:
propan-2-ol:                            50-100%
glycerol:                                    10-25%
2,2'-iminodiethanol                       2.5-10%
dimethylammonium chloride        2.5-10%
lactic acid                                    2.5-10%
hydroxyacetic acid                        <2.5%

Thanks in advance

Kevin G.

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