Disadvantages include the detection of only surface flaws, skin irritation, and the inspection should be on a smooth clean surface where excessive penetrant can be removed prior to being developed.

But nobody can ignore the total, if temporary, stoppage of the music, which occurs when the CD laser can't read what's on the record because of surface flaws.

And they're not surface flaws.

The slightest roughness or dimpling of the wing surface is enough to trigger turbulence, and even today, manufacturing techniques leave too many surface flaws to permit laminar flow.

These surface flaws resemble a small black dot and may affect the clarity of the stone depending on the size of imperfection.

And those were just the surface flaws.

The spall starts in surface flaws caused by bending of the inner, polycarbonate layer and the cracks move "backwards" through to the impact surface.

All the print surface flaws that the Allen and Unwin plates had accumulated up to that point were faithfully reproduced in film for the remaining printings.

This is because any surface flaws tend to be pressed closed by the retained compressive forces, while the core layer remains relatively free of the defects which could cause a crack to begin.

But it has no surface flaws and fewer gaps, called voids, in the inner plies.