I tried the 6% peroxide on my seedlings the other day, mixed it 50/50 with rain water.
Spilt some on my hand later and it burnt so was expecting all my seedlings to be dead the next morning but they are fine, good job as I just sprayed them all, didn't think about testing it on a couple first

Also planted some peas today after keeping them in my mouth for 9 mins, thought about doing it with some lettuce seeds but they are too small