Do the mantles still contain Thorium Dioxide? Does it say anything about heavy metals/radioactivity on the packaging?

Thorium Nitrate is what most mantles are dipped in newer ones use yttrium or cerium. When burned the first time the thorium is changed to thorium oxide, and this is what you see when you use your light. It has basically been converted from nylon webbing to ceramic. An inch away from a thorium mantle and you’re at background radiation so the radioactivity at the actual mantle is near negligible (still there but not harmful).

I have an old model 231 dual mantel colman lantern. On the lantern it recommend to use 21A mantels. Would these fit?

Yes, the #21 Sock style filament would be the replacement part needed for the Coleman Sock Tie-Style Mantle you mentioned.

How long does it burn?

The cloth of the mantle burns away very quickly leaving the ash which is what makes the light. The ash will last as long as it isn't disturbed, so with a little care it can provide light for many hours.

If I want the dark green color carrying case, is it available and can it be assured?

This is the wrong listing, but if you are referring to the green "lantern case," the color in the listing is generally random. If you are referring to the coleman fuel carrying case, it is only available from Japan Amazon and is green.

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Coleman String Tie Lantern Mantles, 4-Pack of Coleman Lantern Mantles for Fueled Lanterns

Product ID: 253721498

Details

Brand
Coleman
Colour
Material
Blend
Number of Packs
4
Product dimensions
18.3L x 11.9W

🔥Ultra-bright light output

🧵Innovative string tie for easy install

🇺🇸Proudly made in the USA

€ 24.64

Duties & taxes included

In stock

Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💡 Light up your nights, own the outdoors.

EFFORTLESS SETUP - String tie design means no fumbling—get your lantern glowing in seconds.
RELIABLE BRIGHTNESS - Engineered to deliver consistent, soothing light for all your outdoor escapes.
PERFECT COMPATIBILITY - Fits a wide range of Coleman fueled lantern models—your go-to replacement mantles.
ADVENTURE READY 4 PACK - Stock up and never run out of light when you need it most.
DURABILITY YOU CAN TRUST - Crafted with premium materials to outlast cheap alternatives and keep you illuminated.

The Coleman String Tie Lantern Mantles 4-Pack offers a hassle-free, durable lighting solution for fueled lanterns. Made in the USA, these mantles feature an innovative string tie for quick installation and provide reliable, bright illumination to enhance every camping experience.

Specifications

ASIN	B000J084KY
Best Sellers Rank	#159,328 in Sporting Goods ( See Top 100 in Sporting Goods ) #785 in Camping Coolers
Brand Name	Coleman
Color	Multi-coloured
Customer Reviews	4.7 4.7 out of 5 stars (10,940)
Global Trade Identification Number	00076501204629
Included Components	MANTLE SOCK TIE 4PK C050
Item Dimensions L x W x H	18.3L x 11.9W x 0.1H centimeters
Item Type Name	MANTLE SOCK TIE 4PK C050
Manufacturer	Coleman
Manufacturer Part Number	3000004344
Manufacturer Warranty Description	Manufacturer warranty.
Material Type	Blend
Model Number	3000004344
Number of Items	1
Number of Packs	4
UPC	076501249392 076501204629
Unit Count	1 Count

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