Colorful Use of Coffee

Methylene blue, methyl orange, and a jug of coffee commune almost poetically, with the third of these acting attractively in opposition to the first two, in this newly published study:

Carbon Adsorbents from Spent Coffee for Removal of Methylene Blue and Methyl Orange from Water,” Inga Block, Christina Günter, Alysson Duarte Rodrigues, Silvia Paasc, Peter Hesemann,  and Andreas Taubert, Materials, vol 14, no. 14, July 16, 2021. The authors are at Universität Potsdam, University of Montpellier-CNRS-ENSCM, and TU Dresden.