Yes, that's what color the duct tape was. Gray. "good old-fashioned American gray tape" https://airandspace.si.edu/stories/editorial/duct-tape-auto-repair-mo

Yes, that's what color the duct tape was. Gray. "good old-fashioned American gray tape" https://airandspace.si.edu/stories/editorial/duct-tape-auto-repair-moon https://airandspace.si.edu/stories/editorial/duct-tape-auto-... The tape and its many varieties have many names. "Duct tape" is commonly used today, but was not as common then, and wasn't in the dictionary until part way through the Apollo program.