煤 is a Japanese kanji written with 13 strokes, listed here under the keyword “soot”. It is built from 某 (so-and-so) and 火 (fire). In Remembering the Kanji by James W. Heisig it is frame 2600.
On KumiJi Glyph Explorer, open the parts search and type “so-and-so” + “fire”. 煤 is among the results, together with every other character containing the same shapes.
Open 煤 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.