Powdered Rosin works well, if you can find it in a shaker can that makes it quite easy to use. Flakes Carnuba wax works well also. The wax was suggested by Walt that owned NEI bullet molds at the time. It is a bit expenisve but just a small pinch works so a little goes a long way. You can probably find it in flake form in ebay.  If you can't find in in flake from you can use a cheese grater of some sort to turn it from solid to flake. (You need to Login or Register to view media files and links)
Sam

    I generally use a generous pinch of sawdust from the table saw.   Resinous woods like pine and cedar are best.   Cheap, too!!   The object is to achieve a "reducing atmosphere", so the oxides separate more easily from the metal.    I like to flux when the pot is first melting, ca 600F.  If you wait until it is up to 750F, it is likely to catch fire.
     As has been suggested, stirring with a pine stick with a knot in it is a good flux.

CHRIS
RGChristensen

I use a small dab of my lube.  Dumped my Marvelux. Nasty stuff!

Jack

I learned the Marvelux lesson many years ago.  It was rusting stuff in the neighbor's garage    Nasty stuff!

Hiwall55 wrote on Nov 6^th, 2017 at 8:59am:


I am too cheap to BUY marvalux, so I use BORAX and stir with a pine (or better smelling wood) stick (1/2x3/4 or so).

NO problems, the stirring with wood keeps the sides of the pot CLEAN!

Watch the moisture content of the wood - it can get interesting.

I have also been doing the same for a couple of years maybe longer Jan. It goes back to when you first mentioned it on here and it works good for me.

JLouis

Don't ask me exactly what it is but I believe it to be borax based ... an electric lineman friend said about 5 years back wants some flux?  'We used it years ago to flux the gas pots when we used to sweat joints.'  It is a yellow-white cake.
So he cleaned out all there was in the utility's inventory.
A piece about the size of a marble and the dross is only a black-gray ash and the melt looks like a mirror.
Further, have another friend that bought a commercial casting business running 2 Magma Master Casters. His flux was using the lube on defect bullets and the dross looked like solid chunks of lead.  So I melted some down for him and found it was 62% lead alloy.  Gave him some of the flux I had, he started using it and now his bullets look like they were hand cast and the dross is like mine, black-gray ash