androtics sprays every package with Instant Shine…it certainly evokes positive emotions!
here is a post by tisha on the topic: Does anyone know if pheros work on paper?
i don’t want to go off-topic too far, but here is another example of pheromone usage (androstenone) on letters:
“In 1991 …researchers found that people who receive bills scented with androstenone …were 17% more likely to pay up than those who received unscented bills.”
Source: http://www.sirc.org/publik/smell.pdf