“…To enable FCPM, the LC mixture has to be doped with a fluorescent dye. Following the guidance of the original FCPM studies [8,150], we used a dye N,N ′ -bis(2,5-di-tert-butylphenyl)-3,4,9,10-perylenedicarboximide, in FCPM literature called BTBP, but also known as DBPI, with a structure shown in Fig. 5 The dye itself has poor solubility in the CCN mixture.…”