Chemistry

Binary Phase Diagram (Lens)

liquidus & solidus vs. composition

Between the melting points of pure A and pure B the liquidus and solidus bow apart into a lens, and any melt in the gap is part liquid, part solid.

Computed & rendered in pure C# on the frozen OnlyCSharp 1.8 library — animation baked to GIF with the library's own Gif encoder (no GPU, no ffmpeg, no external packages).