They have changed thier web page but they had at one time showed how they did it. Special pens that hold one deer and pans under the pen.
They have also come out with new products. I have always bought the 2oz. bottles. I'm not much for new products and do not believe in all these new clothing kimmicks and never believed in any deer scents either. I'm from the old school with wood smokey camps, cigarret smoke, bacon smell, no shower for a week and still harvested deer in the toughest of areas where there were hardly any deer.
If anyone is interested in wearing wool colthing check out
Beagle Outdoor Wear, Inc. | Next Generation Wool Outerwear they are pricey but worth the money. Bought the stalker coat(green) several years ago and is great in the cold, rain and snow.
Why green? You can wear anytime. Why wear camo when you have to also wear bright orange.