Kodachrome-II (K-2) (ASA/ISO 25) and Kodachrome-X (K-X) (ASA/ISO 64) both used the same development chemistry, K-12 Process. Kodachrome 25 (KM) and Kodachrome 64 (KR) replaced K-2 and K-X respectively circa 1974-1975. Both used K-14 Process. Circa 1985, Kodachrome-200 (ASA/ISO 200), was...
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