These cassettes were black, and could be rewound on a Cartrivision recorder. An optional monochrome camera manufactured for Cartrivision by Eumig could be bought to make home videos. A color camera was in the works but never materialized before CTI's demise. Avco Corp. introduced Cartrivision at the Consumer Electronics Show in New York in June 1970. It was first sold in June 1972, mainly through Sears, Macy's, and Montgomery Ward department stores in the United States. Manufacture ended thirteen months later in July 1973 after poor sales. Later, it was found that Cartrivision tapes that had been stored in a warehouse had disintegrated due to humidity. After the demise of Cartrivision in 1973, many Cartrivision-equipped TV sets, separate recording mechanisms, tapes, and other parts and accessories were liquidated by surplus retailers, mainly in California, and many electronic hobbyists bought quite a few of the Cartrivision systems. Some made their own homebrew modifications with the hardware, such as a stand-alone Cartrivision player in its own chassis with a RF modulator to hook it up to any TV set, much like later VCRs.