Squirt a good amount of black paint into the bottle. The glue will look a dark cloudy grey.
Put the lid back on and shake well. If the glue is not shaking together, squeeze into a cup, mix and use a funnel to pour the black glue back into the bottle.
Download and print out the necktie template.
Trace the template with black glue.
Allow the glue to dry completely. Place in the sun or allow it to dry overnight.
Use watercolors to paint. The black glue will keep the colours from bleeding into other areas.