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Wasu rini (kai tsaye,acid, matsakaicin acidic, reactive, da sauransu) an haɗa su da ions ƙarfe (jan karfe, cobalt, chromium, nickel ions) don samar da nau'in rini.Wanda yake narkewa a cikin ruwa kuma samfuran rininsa sun fi juriya. hasken rana ko wanke-wanke.Misali, hasken rana kai tsaye resistant Emerald blue GL (Lionolblue GS) da acid complex blue GGN(Acid Complex Blue GGN), da sauransu.
1: 2 Rinin hadaddun ƙarfe suna da nau'ikan aikace-aikace masu yawa, waɗanda za'a iya raba su zuwa ƙasa ƙarƙashin masu zuwa:
a) Aikace-aikace a cikin sutura (tawada, fenti).Misali, canza launin itace, tawada na bugu, canza launin karfe, da sauransu.
b) Aikace-aikace a cikin robobi, galibi ana amfani da su azaman masu launi (fluorescent) don robobi
c) aikace-aikace na musamman, irin su takarda kakin zuma ko kayan kyandir, canza launin takalma, canza launin fata na fata, kayan kwalliya da sauran launi.
1:2 Karfe hadaddun dyes ne dyes da suke soluble a Organic kaushi kamar aromatics, esters, styrene, methyl methopropionate, da dai sauransu. Organic kaushi da aka ambata a sama sun kusan insoluble a cikin ruwa.
Babban inuwar 1:2 Karfe hadaddun rini sune: rawaya, lemu, ja, blue, baki, da ja mai kyalli (peach).Haka zalika akwai rini mai hadadden karfe da ake kira 'China Red' a kasuwa mai tsananin haske.Ana kuma san shi da sunan Red Flag Red.