shrinky dinks?

[unacquiesce.livejournal.com]

true or false:

you can use plastic that's not specifically the shrinky dink brand to make shrinky dinks.

i feel like someone on here said something about using "#6 plastic containers"? where would i find those?

thanks in advance!

ETA: what prompt and insightful answers! you guys are badass, thanks so much!