Yes, Turf Mark Blue can be added to Boracare and Timbor.
The Turf Mark Blue Tablets can turn the wood blue permanently. While we cannot say if we think Terminix is charging a fair price or not for liability reasons we can tell you that if you are willing to do the labor yourself you will save a lot of money.
You can use the Turfmark Blue tablets with Sedghammer. Color mark lasts 1-2 days and breaks down in sunlight and moisture on foliage. Rate: 1 tablet per 1-2 gallon (3.8-7.6 ltr) of spray solution.
We do not see why you could not use Turf Mark tablets with Trimec992. To verify the compatibility please contact PBI Gordon Corporation at 800-821-7925.
When Turf Mark Blue Tablets are mixed with an herbicide or insecticide and applied to a lawn it will break down in sunlight and moisture within 1-2 days per the label.  If used on wood that is not exposed to the elements it can permanently dye the wood blue.  So both answers are correct; it all…
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