Menthol detection on tobacco

1. A method for detecting mentholated tobacco, from non-mentholated tobacco within a product stream comprising irradiating tobacco containing menthol and a fluorescent taggant with radiation and observing the tobacco for fluorescence from the taggant; and removing a portion of the product stream in response to fluorescence.

2. The method of claim 1 , wherein the fluorescent taggant is a Stokes shifting taggant.

3. The method of claim 1 , wherein the fluorescent taggant is an anti-Stokes shifting taggant.

4. The method of claim 1 , wherein the fluorescent taggant is one which upon pyrolysis decomposes primarily into carbon dioxide and water.

5. The method of claim 4 , wherein the fluorescent taggant is an organic taggant.

6. The method of claim 5 , wherein the organic taggant is one selected from the group consisting of pyrazolines, oxinates, benzoxazinones, benzimidazoles, benzthiazoles, thioxanthenes, anthranilic acids, terephthalic acids, aldazines, coumarins, barbituric acids, lumiphores, oxazoles, thiazoles, cumene, stilbenes, and derivatives thereof.

7. The method of claim 5 , wherein the organic, fluorescent taggant is selected from the group consisting of quinine, fluorescein, carmine and indocyanine green and derivatives thereof.

8. The method of claim 1 , wherein the fluorescent taggant absorbs invisible radiation and emits visible radiation.

9. The method of claim 1 , wherein the fluorescent taggant absorbs ultra violet radiation and emits visible radiation.

10. The method of claim 1 , wherein the fluorescent taggant absorbs infrared radiation and emits visible radiation.

11. The method of claim 1 , wherein the tobacco is scrap tobacco and further comprising separating the mentholated tobacco from non-mentholated tobacco in the scrap.

12. The method of claim 1 , wherein the tobacco is disposed in a tobacco rod which is irradiated with near infrared radiation from a high intensity IR LED light, and reflected IR light is observed using a high speed NIR spectrometer sensor tuned to detect fluorescence emitted from the taggant.

13. The method of claim 1 , further comprising the steps of:

(a) adding a fluorescent taggant to menthol contained in at least one processing machine;

(b) conveying a product stream that has been processed by the at least one processing machine;

(c) irradiating the conveyed product stream with infrared radiation;

(d) detecting infrared radiation emitted from the irradiated product stream due to the presence of the fluorescent taggant and generating a first signal in response thereto; and

(e) removing a portion of the conveyed product stream in response to the first signal.

14. The method of claim 13 , further comprising the step of

(f) illuminating the conveyed product stream;

(g) detecting light reflected from the illuminated product stream;

(h) comparing the light reflected from the illuminated product stream with light that would be expected to be reflected from an illuminated product stream free of non-tobacco related material, and generating a second signal when the reflected light indicates the presence of non-tobacco related material; and

(i) removing a portion of the conveyed product stream in response to the second signal.

15. The method of claim 14 , further comprising the step of causing the product stream to fall under the influence of gravity in a cascade.

16. The method of claim 15 , wherein the step of removing a portion of the conveyed product stream in response to the first or second signal further includes directing fluid under pressure at a portion of the product stream.

17. The method of claim 16 , wherein the fluid is a gas.

18. The method of claim 17 , wherein the gas is air.

19. The method of claim 13 , wherein the taggant is a Stokes-shifting taggant that absorbs infrared radiation at a first wavelength and fluoresces at a second wavelength, different from the first wavelength.