Table 8. Chemical compounds of shipwrecks (XRD)

Shipwrecks	Sample	Analysis results
Shinan shipwreck	SADI	Iron sulfide, iron carbonate, sulfur, aluminum hydroxide, silicon oxide
	SADO	Iron sulfate hydrate, sodium hydronium, sulfur, iron oxide, calcium sulfate hydrate, calcium silicate hydroxide
	SANI	Iron sulfate hydrate, silicon oxide
	SANO	Iron sulfate hydrate, iron sulfide, sulfur, aluminum oxide silicate
Yeongheungdo shipwreck	YHDI	Iron sulfide, silicon oxide
	YHDO	Iron oxide, iron oxide hydrate, silicon oxide
Jindo shipwreck	JDDI	Sulfur
	JDDO	Iron carbonate, iron oxide hydroxide, silicon oxide
Sibidongpado shipwreck	SINI	PEG 4000, silicon oxide
	SINO	PEG 4000, silicon oxide
Wando shipwreck	WDNI	PEG 4000, sulfur, silicon oxide
	WDNO	PEG 4000, sulfur, sodium calcium aluminum silicate

XRD: X-ray diffraction, PEG: polyethylene glycol.