While in Penang snapped a few pictures that shows those markings on styrofoam fake nests.
They were very clear and firmed.
One with nests while the two were with strong markings:
The important thing here is that this super pheromone helps in populating any BH as long as there are birds entering your BH.
Combined with proper sound plus appropriate internal sound tweeters location you will be able to get them to populate the desired part of your BH
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