The ornamental design for a diffusingevaporator of activesubstances, as shown and described.
FIG. 1 is a front, top and left side perspective view illustration of a diffusing evaporator of active substances, according to an aspect of the new design;
FIG. 2 is a front view illustration thereof;
FIG. 3 is a bottom view illustration thereof;
FIG. 4 is a left side view illustration thereof;
FIG. 5 is a top view illustration thereof; and,
FIG. 6 is a right side view illustration thereof.
The dashed broken lines depict portions of the diffusing evaporator of active substances that form no part of the claimed design.