I finally found an Agfa Super Color cassette in the wild. BASF is from the same batch and I had no idea they did something similar (Flea market; 1$ for both) :
1976 Agfa High Energy Low Noise Audio Cassette | Tape Tardis
Agfa Fe 1 cassette tape, cassette HD wallpaper | Wallpaper Flare
Audio cassette Agfa LNX 90 Ferro
Pinnacle, and Agfa cassettes (Funky Cassettes No.5) | Flickr
Vintage Blue K7 Cassete Tape New Wave Mix AGFA super color" iPhone Case for Sale by Another Apple Club | Redbubble
AGFA FeI-S 90 HDX audio cassette blank tape sealed Made in Germany Type I | eBay
BREMEN, GERMANY - MAY 29, 2019: Sealed Audio Compact Cassette AGFA Ferrocolor HD FeI 90 Red Old. Rare Viantage Audio Cassette, Front Close-up View On White Background. Stock Photo, Picture And Royalty
Cassettes 1983 - 1984 | In Aeternam Vale
Stockholm, Sweden - October 9, 2021: A yellow funky C60 compact cassette tape C60, branded Happy Tape, produced in Germany 1977 by Agfa-Gevaert AG fo Stock Photo - Alamy
one AGFA FE I FERROCOLOR HD 90 BLANK CASSETTE TAPE | eBay
AGFA C-DX II S SUPER CHROME 60 BLANK CASSETTE TAPE (1) (SEALED) | eBay
Agfa LNX - 1985 - EU
Agfa CRII-S - 1982 - EU
Stockholm, Sweden - October 8, 2021: A 1977 audio compact cassette C60 tape and case branded Happy Tape, produced by Agfa-Gevaert AG for the Swedish Stock Photo - Alamy
7 Cassettes In 7 Days - Day 7 - Agfa FEI-S - YouTube