Colored Dot Freezer Stickers?

[ugaug]

We (Conary & Drew) are thinking that it would be useful at times to have easy-to-see visual queues for labeling objects. E.g., large circular stickers that either green, blue, yellow, or red. Here's an example use case. A rack in -80 freezer can have a barcode on the end, but it would be much more useful if it had a clear indication that could be parsed visually w/ almost no effort. like a big blue circular sticker. does anyone have a source of 1" diameter colored dots/stickers that work on most surfaces?

[ugaug]

[ugaug]

Order placed. Will try stickers above and report back.

[ugaug]

The stickers have come in. They don't stick to things that are already cold. They do stick to things at room temperature. So stuck things remain stickered when placed in the cold. Frost on objects obscures the stickers.

[ugaug]

Ideally, we would have a sticker that works (i.e., sticks) regardless of the temperature of the object being stuck.

[ugaug]

Does anyone have a recommendation for a better sticker to try?