What happened to Jesus's Nephite disciples after he blessed them?

They became as white as Jesus.

Which was whiter than anything else on earth.

It came to pass that Jesus blessed them as they did pray unto him; and his countenance did smile upon them, and the light of his countenance did shine upon them, and behold they were as white as the countenance and also the garments of Jesus; and behold the whiteness thereof did exceed all the whiteness, yea, even there could be nothing upon earth so white as the whiteness thereof. 3 Nephi 19:25

And when Jesus had spoken these words he came again unto his disciples; and ... he did smile upon them again; and behold they were white, even as Jesus. 3 Nephi 19:30