any color is a filter, so silver is brighter, but rear reflectors need be red, in vehicle codes.

Will the PD cite you? May not be a priority.

;)

kinda interesting how black reflects as gray/white and brighter than blue color.

I think this setup is unsafe. Better use high-vis boxes in yellow or orange, with large reflective stickers on all sides and corners, high and low. On the rear that may have to be be reflective red, and on the sides reflective orange, if the legislation in your country requires so.

And I would use more cordage, that is at least twice as thick. The cord should be clean and without signs of wear. And it should have well selected professional knots.

More pictures https://imgur.com/a/HdV8K

Finally finished covering my entire bike in reflective vinyl tape. Well, more like I got vinyl sheets instead of tape. Liked it so much and had spare vinyl that I wrapped up my gf's bike too + helmet.

For those curious I used 3M 780mC-10R (reflective white), 680CR (reflective blue), 1080 (florescent pink) vinyl plotter sheets. You can buy them from sign/graphic/car-wrap-shops.

What's the front rack on that one?

Tubus Tara on the front
Bontrager Deluxe on rear

Stretchable Reflective Tape versus Paint
 

Reflective paint is easy to apply and is relatively bright. My issue with it is that it looks like I painted my bike with a fine sand. I like using a flexible or stretchable reflective tape. Tapes are brighter and can be removed. Flexible ones will not lift at the edges like the stiffer tape such as 3m diamond grade. I have tried two types of stretchable reflective tape, high intensity and engineer grade. Engineer grade flexible comes in many colors and is brighter than reflective paint. The white is rated at about 75 candelas. High intensity flexible only comes in 3 colors. White, orange and yellow. However, it is 3 times brighter than engineer so you can be seen much further away. I bought mine at a site called tapedealer. I believe identi tape also carries it.