Hi all ! Familiarising with my brand new Trangia 27 duossal kit, I noticed the kettle, pans and frypan are becoming yellow colored, on the bottom. I don't know if it is normal. I tryed to clean it up, but seems that the alloy is "blued" (not sure it is the right term). I always use premium meths, diluted with water, as mentionned in Trangia manual. I don't know if it us normal, I doubt when I see your clean but used kits. Thank you by advance for your advices and suggestions. Sylvain
I would not worry about it. I bought both the 25 & 27 duossal kits which I found NOS. I do not bother to put water in the alcohol. The base of mine is exactly the same, but has not extended up the sides like yours. Perhaps make more use of the simmer ring. Personally I do not believe in "dry baking" , make sure you have food or water in the pans at all times. Norm
Mee too. That's why it wasn't an idea for that result. Ok, so must i figure out it is normal ? I prefer that ! As you say, it must be a part of the Trangia users ! Thank you so much ! Sylvain
Hi Sylvain. In the U.S. our denatured alcohol at this time is close to 50/50 percentage of ethanol/methanol. When I use this fuel my Trangia pans do not become very discolored. We also have another fuel called "Green" denatured alcohol with a higher +90% ethanol content. This fuel burns hotter and browns the bottom of the pans very similar to your picture. Unless there is a wide variety of fuels available in your area there isn't much you can do. Ray
Hi Ray, It may be a part of the answer, I use 95% ethanol meths ! Here, it is the high grade burning spirit. And I have it for free at work !
The term Blued is used to describe the chemical coating used on Rifle barrels and Hand guns that causes the metal to demonstrate a dark blue color. It also means the coloring displayed on metals such as your cook pots, motorcycle exhaust pipes, and Semi truck exhaust pipes when Heat is applied. Starting with the heat range, yellow being the lowest level of heat to red, blue and white as the hottest where metal begins to flow as a liquid. You may never see red to blue with aluminum as it has already turned into a liquid unless it is an alloy. You should be proud of your discolored pot turning yellow, it is the sign of an Outdoorsman! I never ever re-polish mine. Your new aluminum pots may reflect a dull finish and the reason for that is to harden the surface. Some surface hardening for aluminum employs a blasting using a plastic media. This causes the metal crystals to change shape and compress increasing the surface hardness and assists the resistance of corrosion.
Came back on sunday night from a short camp in Germany. Used the simmering ring. the kit is far more blued. No worry anymore. It isn't a brand new one anymore ! Nice background ! Pro : I am close to the toilets, just behind my tent ! Cons : I am close to the toilets, just behind my tent... Sunday morning, 6.30 AM, just after violent rain and wind, and just before snow, let's stow all the stuff to go back home...
Hi, Patatwin, Very normal for your pots to get that brownish patina on them, after use. Leave it and don't try to clean it off! The darker it gets, and better your pots will work. Mine look dark brownish/black on their bottoms, and perform wonderfully that way. You have a good start, now just keep using your pots, and let the "brown begin"!!!! Hope that helps, and God Bless! Every Good Wish, Doc
Thanks Mark ! In fact, my kettle is black now on the bottom, and yellow on the sides, but as you all told me here, it is normal, so I don't worry anymore ! I blued a stainless pan bottom, too ! I just have to stow the kit quickly after use, my wife doesn't joke on cleanliness ! It is part of the game, too !
After the first use of my duossal pan the bottom of the pan looked like this. Is it normal? Is it because I used bioethanol (95%)?
+1 I don't know about the inside (I don't own a duossal). The external spot will scrub off with a plastic or metal scourer pad. Many of us leave the outside to go black. I don't know if it helps, other than avoiding making a mess when cleaning on a hike.
Thanks for the answer. I think I figured it out: (inside) stainless steel consists chromium and on high heat it reacts with oxygen. The result is rainbow spot (it is like thin layer on the steel). It is not bad or anything but you can remove it with vinegar.
I got similar kind of 'rainbow spot' inside of my Snowpeak titanium cup when I used it to make coffee on Optimus Crux. 'Rainbow spot' has vanished over the years when I have used the cup.
