If you don't wash them, it tends to mute the brightness.
I e-mailed Avery a week or so back to see if they could offer a muted reflective silver material for the graphics, like you sometimes see on running shoes that glow softly (not brightly) in the dark for increased visibility during evening walks. On a camper, it would be silver graphics by day, increased visibility when traveling at night. Not sure if something like that would be legal throughout all of North America, though. I have not heard back from Avery. Probably won't. But I thought I'd at least ask them about the possibility...
It's 3 inch DOT reflector tape. I got it on Amazon.
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I was just looking at a specification sheet for the Avery HP 700 film and noted that vertical durability isn't the same for all colors. The maximum for this series is 6 years, but there are exceptions. Gold and Silver are 3 years. High Gloss Red is 4 years. Tangerine and Bright Orange are 5 years. Iguana Green is 1 year.
There is an Avery 900 series film that has a 12 year rating and is suggested for RV's. The adhesive is different so ETI might not want to offer it.