DESCRIZIONE
We describe a method for detection of the presence of an invertebrate or an invertebrate component in a sample of substantially non invertebrate material, comprising impinging said sample with a source of electromagnetic radiation at a wavelength of at least 600nm and detecting Raman scattering/fluorescence of said invertebrate or a component of said invertebrate at a wavenumber where the non- invertebrate components of said sample either do not fluoresce or fluoresce with sufficiently low intensity wherein the non invertebrate material is edible and/or living.