The Parker Solar probe will launch soon, and over a period of years and several planetary flyby's loose enough energy from its heliocentric orbit to reach an orbit with a perhihelion of only about 4 million km.
The Spacecoast Daily article Traveling to the Sun: NASA Describes ‘Why Parker Solar Probe Won’t Melt?’ links to the video Blowtorch vs Heat Shield which shows only dark carbon-like materials, but in the video Why Won't it Melt? How NASA's Solar Probe will Survive the Sun the surface of the heat shield is white, as it is in the photo below.
What material will make up the surface of Parker's heat shield that faces the sun, and what is its reflectivity in visible and near IR wavelengths where most of the Sun's intensity falls?
The caption for the image from here says:
Parker Solar Probe’s heat shield is made of two panels of superheated carbon-carbon composite sandwiching a lightweight 4.5-inch-thick carbon foam core. To reflect as much of the Sun’s energy away from the spacecraft as possible, the Sun-facing side of the heat shield is also sprayed with a specially formulated white coating. (NASA Image)
More about the heat shield in this answer.