How to store chili powder for a long time. Tips for preserving color and taste

Hello
I'm the daughter-in-law of a servant's family.
I keep red pepper powder every year.
That's how I learned it.
I put it in a pat jar.
I've also stored it in a compression pack.
Now, even if this is more than a year,
It was preserved as it is.
If you have a better idea, please leave it in the comments.^^
Let's share good ways with each other.
Garlic and red pepper powder are good to keep and eat.
Red pepper powder discolors and tastes less when you get along with the air.
The red pepper powder color was still alive.
Subscribers, did you buy chili powder?
I hope you all buy good chili powder and eat it well.
Thank you so much for taking such a nice step today.