Experiment with Borax

[@mikestevens8046]

For me its not what's on the surface but what is the porosity level inside the casting. I need to rough cast copper for machining it into parts later. I don't want any bubbles in the casting. It would be great if you would cut some ingots in half so we could really see what's going on inside. Thanks

[@omjidar]

Thank You for the insight keep posting knowledge.....

[@kursor6127]

I stoped use of borax some time ago. IT stick to crucible and its mess. I stir very well metal when its in pouring temperature and that make all oxidation emerge to the surface, where i skim It with spoon. Its good to do that twice before pouring. For me thats the best option but i cast only small objects in brass.

[@meltedworld]

I agree with your opinion ...

[@walkthroughmania1]

Yes, I believe the skimming may help achieve different colors and the weight. But they already changed colors without skimming??

[@patricks.hafersr.8723]

Ever try pipe soldering flux?? If you brush it in while the copper is hot let say 600-800F then wipe it off copper comes out brilliant pink copper. Great channel always look forward to you videos.

[@meltedworld]

I think I'll try. Thank you.

[@jamesway5036]

Very interesting 🤔

[@danielec2752]

With or without? But the difference is only the color?

[@meltedworld]

Perhaps the copper didn't have enough impurities to make it more noticeable ... aside from the pink hue.

[@john_zomb]

Really cool, was there a weigh difference? Did the borax attract more impurities to come out?

[@meltedworld]

I only noticed a substantial difference in the third ingot ... lighter and brighter. Maybe the copper I used was too clean ...

[@dk7863]

👍

[@lawrenwimberly7311]

Try equal parts borax and broken glass

[@calvinsalim2375]

Is the glass a source for carbon and silicone?

[@lawrenwimberly7311]

@@calvinsalim2375 it helps keep the oxidization under control... the borax lowers the melting temp of the glass, and forms a layer on top preventing oxidization

[@calvinsalim2375]

@@lawrenwimberly7311 ah i see thanks dudee, gonna try it

[@jacobpeters5458]

should you prime the crucible? if so how? and when do you add the borax?

[@lawrenwimberly7311]

@@jacobpeters5458 as soon as the metal starts to melt, add a teaspoon of borax, and a handfull of glass shards... the borax will lower the melting temp of the glass and make a molten glass cap to keep the oxy away from the metal... no prep needed