Here's the powder.
1 seconds sound clip from the The Secret of NIMH (1982) movie soundboard.
You can hear this line at 01:00:11.111 in the Blu-ray version of the movie.
Quote context
[...]
- Hey! I've got string. I've been saving them.
- You do?
- Oh, sure. Red ones, blue ones, green, yellow...
- Pay attention. Go get all the string you can.
- I... I just thought I'd mention in passing... I've always wanted a sparkly of my very own.
- Sure. Excuse me. Pardon me. Bye.
- Won't be long now. She's washing the dishes.
- Nervous?
- Very.
- Well, don't be. You'll be okay.
- I hope I haven't upset your plans.
- Nonsense. What makes you say that?
- I thought I might've caused an argument.
[...]