Interactive comment on “Development of the drop Freezing Ice Nuclei Counter (FINC), intercomparison of droplet freezing techniques, and use of soluble lignin as an atmospheric ice

The authors present the development of a drop Freezing Ice Nucleation Counter (FINC), a droplet freezing technique (DFT), for the quantification of INP and INM concentrations in the immersion freezing mode. The authors used an NX-illite suspension and an ambient aerosol sample for an intercomparison (INP) study and propose herein the use of a water-soluble biopolymer, lignin, as a suitable ice nucleating (INM) standard.