diaper urine activated smell

[247dlwear]

I remember back in the 80s and 90s most baby diapers and some adult (attends) had a smell to them that was activated when you pee in them. I miss that. Is there any diapers out there to day that have that or is there anything you can add to a diaper to do that. I know there is diaper scents you can add to a diaper but its not urine activated. Meaning that there is almost no smell at all until you pee in them.