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"~. INVESTIGATIONS INTO SMOKERS' BEHAVIOUR - . ~ A method to determine the depth of insertion on smoked cigarettes by H. Barkemeyer, W. Schulz and F. SeehOfer B-A•.T -Gi9arettenfabriken GmbH, Bahrenfelder Chaussee 139, 2000 Hamburg 50 Purpose of the study, In ventilated filterciyarettes, the degree of ventilation could be influenced by the position of smokers' lips - - - on the tip, this means by the depth of insertion. Tb get more insight In these relationships we have developed a new rapid and precise method for measuring the Insertion depth. - - Procedure + Principle of the method t The Imprint of smokers' lips Is made visible via the a amylase of salivae The amyiase Is transferred from tipping paper onto a wet, starch impregnated strip of silica gel on aluminlum foil. After Incubatlon for 10 -20 minutes at 37', the strip is sprayed with iodine solution. Whlte areas on a blue background Indicate the position of the lips on the tipping paper. C w.1,.t.rc11 h"MNwNN s/llta NI wr1o

Resutts, The data obtained with the new developed method ; wpre e(974, 441 butts from more than 300 Serman smokers compared with results from foregoing studies. As can be have been evaluated via tracss from Iipstleks, ses there Is a close agreement. . saliva and ash on tipping papers In every case the mean Insertion depth Is about 11 mm ~ X mm S mm Q mm 1974 10.89 2,14 10 1984 11.53 3 0~ 11 s~s,cs~zoz e 19841 560 butts from 42 german smokers evaluated by the amylase method CONCLUSIONS: I. The method is well suited to measuring large samples of butts; espootalty "field samples" 2. Th. results obtain.d are In close ayr.em.nt with former results obtained by oth.r t.chniqus 3. Dependinq uponn th. position of the ventilation zones in differ.nt brands, preliminary r.suits show that 20 - 50 x of smokers could r.duce more or less the degree of ventilatlon.. .