Generally speaking, if the laser perforations are very uniform, after smoking, the filter end will have a very uniform white ring on the outside, with the inner part (the section that filters tar) being yellow, lighter on the outside and darker on the inside
Produced by Hollingsworth & Vose from 1952 to mid-1956, each filter contained 10-15 mg of compressed asbestos fibers, totaling 15-25% of the material
By 1877, he was so successful with these products that he bought a small tobacco factory, previously owned by the tobacconist William Wright at number 45, Broadmarsh Nottingham
The scattered tobacco scraps might be reusable after re-moisturizing (they are easy enough to funnel from paper towels into anything)
The principle is: the lighter, the better.The recessed filter doesn't allow your tongue to touch the filter, thus keeping the moisture away from your mouth