dissolve into something
1. . Lit. [for a substance to change from a solid state into another state; [for a substance] to melt or liquefy something. (Compare this with dissolve in something.) In a hot pan, the sugar dissolved into syrup.
2. Fig. [for someone] to begin suddenly to display laughter, tears, giggles, gales of laughter, etc. (See also dissolve in something.) The children dissolved into tears. The clown's appearance made the audience dissolve into laughter.
3. Fig. [for a film or television picture] to fade away into some other picture. The scene dissolved into a shot of the interior of the castle. At this point in thescript, dissolve to a face shot of Walter.
dissolve something into something
to cause a film or television picture to fade away into some other picture. (See also dissolve into something {3}.) The director dissolved the picture into the next scene. At this point, the opening scene should be dissolved into a side shot of the exterior.