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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Analysis of flux spreading by the 3D laser confocal microscope. Solder joint on glossy (white) mask (a) and its 3D scan (b); solder joint on matt (black) mask (c) and its 3D scan (d). The volume of the flux was measured only in the highlighted area (cyan color)—shown in (a) and (c).