That is cherry picking. I would argue that most small molecules are transparent in the visible window. Water is not the exception but the norm. #Chemchat
Framework Materials Chemist (MOF, COF and other organic frameworks). Juniorprofessor at University of Halle, Germany Posting about science. orcid.org/0000-0003-1156-033X www.chemie.uni-halle.de/ak_haase