--- title: White Flux vs. Black Flux Video description: Flux is a chemical compound applied to joint surfaces before brazing. The addition of metallic boron changes white flux to black. This new video clip will show you the difference between these materials. image: https://blog.lucasmilhaupt.com/hubfs/LucasMilhaupt_August2017/Images/black_flux.jpg --- [![Lucas_Milhaupt_logo_digital](https://blog.lucasmilhaupt.com/hubfs/Lucas_Milhaupt_logo_digital.jpg)](https://www.lucasmilhaupt.com/) - [Products](https://www.lucasmilhaupt.com/Products) - [Filler Metals](https://www.lucasmilhaupt.com/Products/Filler-Metals) - [Fluxes](https://www.lucasmilhaupt.com/Products/Fluxes) - [Pastes](https://www.lucasmilhaupt.com/Products/Pastes) - [Distribution](https://www.lucasmilhaupt.com/Products/Distribution) - [Industries](https://www.lucasmilhaupt.com/Industries) - [Aerospace](https://www.lucasmilhaupt.com/Industries/Aerospace) - [Automotive](https://www.lucasmilhaupt.com/Industries/Automotive) - [Electrical](https://www.lucasmilhaupt.com/Industries/Electrical) - [HVAC/R](https://www.lucasmilhaupt.com/Industries/HVACR) - [Medical](https://www.lucasmilhaupt.com/Industries/Medical) - [Microelectronics](https://www.lucasmilhaupt.com/Industries/Microelectronics) - [Oil and Gas](https://www.lucasmilhaupt.com/Industries/Oil-and-Gas) - [Services](https://www.lucasmilhaupt.com/Services) - [Capabilities](https://www.lucasmilhaupt.com/Services/Capabilities) - [Consulting Services](https://www.lucasmilhaupt.com/Services/Consulting-Services) - [Brazing Audits](https://www.lucasmilhaupt.com/Services/Brazing-Audit) - [Tech Support Request Form](https://www.lucasmilhaupt.com/Services/Tech-Support-Request-Form) - [Resources](https://www.lucasmilhaupt.com/Resources) - [FAQ](https://www.lucasmilhaupt.com/Resources-Library/FAQ) - [Literature](https://www.lucasmilhaupt.com/Resources-Library/Literature) - [Demo Videos](https://www.lucasmilhaupt.com/Resources-Library/Demo-Videos) - [Technical and Safety Data Sheets](https://www.lucasmilhaupt.com/Resources-Library/Technical-and-Safety-Data-Sheets) - [Brazing Academy](https://www.lucasmilhaupt.com/Brazing-Academy) - [Brazing Fundamentals](https://www.lucasmilhaupt.com/Brazing-Academy/Brazing-Fundamentals) - [Braze School and Training](https://www.lucasmilhaupt.com/Brazing-Academy/Braze-School-and-Training) - [How to Braze Aluminum](https://www.lucasmilhaupt.com/Brazing-Academy/How-to-Braze-Aluminum) - [Principles of Joint Design](https://www.lucasmilhaupt.com/Brazing-Academy/Principles-of-Joint-Design) - [Why Brazing?](https://www.lucasmilhaupt.com/Brazing-Academy/Why-Brazing) - [Metal Joining: Brazing vs. Soldering](https://www.lucasmilhaupt.com/Brazing-Academy/Metal-Joining-Brazing-vs.-Soldering) - [Metal Joining: Brazing vs. Welding](https://www.lucasmilhaupt.com/Brazing-Academy/Metal-Joining-Brazing-vs.-Welding) - [About](https://www.lucasmilhaupt.com/About) - [Center of Excellence](https://www.lucasmilhaupt.com/About/Center-of-Exellence) - [Certification](https://www.lucasmilhaupt.com/About/Certification) - [Find Locations](https://www.lucasmilhaupt.com/About/Find-Locations) - [Find a Distributor](https://www.lucasmilhaupt.com/About/Find-a-Distributor) - [News & Events](https://www.lucasmilhaupt.com/About/NewsEvents) - [History](https://www.lucasmilhaupt.com/About/History) - [SIL-FOS](https://www.lucasmilhaupt.com/About/SIL-FOS) - [Social Responsibility](https://www.lucasmilhaupt.com/About/Social-Responsibility) - [Careers](https://www.lucasmilhaupt.com/About/Careers) - [Culture](https://www.lucasmilhaupt.com/About/Culture) - [Contact](https://www.lucasmilhaupt.com/About/Contact) # Blog # White Flux vs. Black Flux Video ***Posted by Lucas-Milhaupt Brazing Experts on Jun 6, 2013***   Flux is a chemical compound applied to joint surfaces before brazing.  The addition of **metallic boron** changes white flux to black.  This new video clip will show you the difference ![Handy Flux B-1](https://blog.lucasmilhaupt.com/hs-fs/hubfs/LucasMilhaupt_August2017/Images/black_flux.jpg?width=122&height=140&name=black_flux.jpg)between these materials. We will also demonstrate several uses for black flux.  For example, in a high-temperature brazing operation, black flux may provide better protection.  It can also be helpful with high-liquidus filler metals.  Black flux is beneficial for fast induction heating, as well. Do you braze large parts, using a long heating time?  Black flux can provide additional protection.  Watch as Lucas-Milhaupt's technical staff demonstrates. Last, listen for elements and base materials which require extra care when brazing, to reduce tenacious oxides.  Boron-modified black flux can help ensure a successful braze joint. Please pass this link on to associates who may find information on white vs. black flux useful.  We are happy to share information that leads to Better Brazing.   The Lucas-Milhaupt video on the![04-functions-stages-of-flux-v22.jpg](https://blog.lucasmilhaupt.com/hs-fs/hubfs/LucasMilhaupt_August2017/Images/04-functions-stages-of-flux-v22.jpg?width=153&name=04-functions-stages-of-flux-v22.jpg "04-functions-stages-of-flux-v22.jpg") [functions and stages of flux](https://www.lucasmilhaupt.com/en-US/about/blog/2013/4/stages-of-flux-video) may also be of interest.  As always, [contact us](https://www.lucasmilhaupt.com/en-US/about/contact/) for assistance or information on Lucas-Milhaupt [brazing products or services](https://www.lucasmilhaupt.com/en-US/products/). 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