Urine is best stored in a colored bottle that blocks sunlight. Nobody does it because people want to see the urine and it costs more for the container. Try it.

Were supposed to be be fresh froze no additives. Why would you add glycerin????

Glycerin would explain why the rat gland sweet smell is so faint

Urine is overrated.

Sometimes.

I collect my own urine Red fox and coyote. I will say if I had to choose I would say red fox urine is to me the best universal urine for catching coyotes, red fox, gray fox and bobcats. The urine ME and my trapping partner will be starting our season with this year is 2 years old. Sitting in 100 degree temperature in my shop. Dark with settlement on the bottom of all the gallon jugs. I send a few gallons a year to different notably trappers that would pour it out if it wasn't good. There is a little effort put into collecting quality urine. I have my own guidelines and it works for me. If you are new to the coyote, fox or bobcat trapping world I would be happy to help you out. You can give me a call I will be happy to send you some buddy. Plenty of people on this site help me every year with my wounded warriors trapping event and it is very much appreciated. Good urine does help but nothing works without hard work Plenty of good trapping ground and as often said on here setting on sign.
You can give me a call anytime I will send you a free gallon buddy.
Terry Dowden
cell # 318 240 3041