Unless one is lucky enough to live where they can be grown then you have to shop around - farmer's markets, organic food stores, order them directly from a grower, etc. Or you can buy dried orange peel. Or you use whatever ones you can buy and scrub them well before using - all those things you list can be washed off the peel.

Sometimes there just isn't a choice unfortunately.

Dave

Your very lucky they had that warning on the oranges! Many people dont realize that some fruits and vegetables have bees wax coatings to reduce dehydration and spoilage. There are two kinds of citrus that make a great marmalade. That's clementines sold by the box and some cumquats. These two in combination are really tasty and I like to use all the skins from the cumquats.

Cumquats? Never thought about them. Do you think they are coated with chemicals too?

Dont think so, if they are the ones sold as produce. They are very sticky once cut open and the ones I had used had gigantic seeds inside. The seeds took up 1/4 the insides. The type you see on Christmas wreaths as decorations might have a wax coating, so they hold up better to room temps and exposure to air. Years ago, my dad made a big batch of cumquat marmalade and my cousin (his niece) was offered a jar. She said it sounded like some kind of nasty thing, so she passed on it. My dads older sister (cousins mother), had a big jar of it and offered the cousin some on toast, without telling her what it actually was. She couldn't get enough of it! They also sell large seville orange mix for making marmalade. Its in a big can from Italy and you add tons of sugar to it and pectin, and it makes a decent jam too. Another citrus I made into a marmalade was an Ugli fruit. These look like really badly rotted grapefruits, but are much sweeter and juicier. The skins work well too, even if you use all of the white pith, but I removed about half of it just so it wouldnt make the jam bitter.

As a citrus grower in Florida , I easily forget that others do not have the luxury of walking out to their grove to grab a lemon or other citrus whenever needed .
Last year , I made marmalade with Kumquats and Calamondins . Fantastic ! I have also made it with oranges , grapefruit , lemons and limes in any combination . Different fruit combos give different tastes . Gardengrl makes it with Key Limes - truly amazing !!!
I find marmalade tricky to make . Sometimes it is perfect and other times it is more like syrup . Either way - it is all good . Not a drop is wasted .
You can purchase fresh , organic Florida citrus from many growers who live near me . Our season runs November to April - it varies depending on the weather .
Of course , we prefer that you look for Florida citrus to purchase - IF possible !
I added a link to one of my neighbors who ships starting December. At least he did last year . If you search the site - Florida Agriculture - there may be others who ship sooner .
And no - I personally do not ship or sell to the public .

Here is a link that might be useful: Hickory Tree Grove

Keepitlow -- do you have Trifoliate Orange in your location? Poncirus trifoliata? It's a fairly common ornamental in the South from what I've heard. It grows small, fuzzy oranges that ripen in October. Someone sent me some years back, and they made a very good marmelaide, IMO, although many people do find them bitter. I was careful to scrape the white pith off the peels of mine when I did it, then boiled the peel seperately in a change of water before adding to the pulp/juice I had extracted.

Don't know if this would work for you, or if you even have a source for them, but it's a thought I felt like throwing out into the ether.