lacquer, varnish, seven
漆 centers on the glossy coating lacquer, made from tree sap. The 'seven' meaning is a rare alternative use, not the main idea.
漆 combines 氵 (water/liquid) with 桼, a component that historically represented the lacquer tree and its sap. The character likely originated as a depiction of the tree and the liquid tapped from it.
The left side 氵 is liquid, and the right side 桼 looks like a tree with dripping sap. Picture the sap being collected and turned into shiny lacquer.
For シツ, imagine a sheet of lacquer so glossy you can see your reflection: sheet -> シツ, and the lacquer shines like a mirror.
jet-black; pitch-dark; raven-black; stygian
East Asian lacquer; japan
mortar; plaster; stucco
lacquer ware; lacquerware; lacquer work; lacquerwork
dried lacquer
dry lacquer statue; statue made from many layers of hemp cloth soaked with lacquer
dry lacquer technique; kanshitsu; technique for making objects (vessels, sculptures, statues, etc.) from many layers of hemp cloth soaked with lacquer
varnish
Japanese sumac (Rhus trichocarpa)
tree of heaven (Ailanthus altissima)
carved lacquer technique
vermilion lacquer (made by mixing vermilion into clear lacquer)
poison ivy rash; urushiol-induced contact dermatitis; toxicodendron dermatitis; rhus dermatitis
lacquering; lacquer ware
lacquer shop; lacquerer
japanning; lacquer work
writing in (japan) lacquer
Chinese lacquer tree (Toxicodendron vernicifluum)
lacquerware
a lacquer painting