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Wood glues like Titebond are PVA-based glues. So is Elmer’s white school glue, which is also very good at bonding wood. Wood glues are yellow either because of added resins that make it tackier when wet so clamped boards don’t slide around as easy before the glue dries, so that the glue dries to a harder, more rock-like consistency rather than staying slightly flexible, or because wood is kind of yellow so they wanted it to look like wood, I’ve heard all three and I’m not sure which is true. Titebond does sell a brown wood glue so that it blends into darker woods like walnut and ebony though.