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We use the self-consistent stellar populations in the Binary Population ASpectral Synthesis (BPASS) models to assess whether NGC1850-BH1 is a blackhole. Using search criteria based on reported physical properties in theliterature we purposefully search for suitable systems with a black hole (orcompact object) companion: we do not find any. Good matches to the observationsare found in models where the bright component is a stripped star and thecompanion is natively (meaning we did not impose this in our search) 1 to 2.3magnitudes fainter than the primary in the optical bands. This alone canexplain the lack of detection of the companion in the MUSE spectra without theneed to invoke rapid rotation, although the conservative mass transferexhibited by these particular models is likely to lead to rapidly rotatingcompanions which could further smear their spectroscopic signatures. We advisethat future claims of unseen black holes in binary systems would benefit fromexploring detailed binary evolution models of stellar populations as a sanitycheck

To be or not to be a black hole: detailed binary population models as a sanity check