Abstract: A essentially solvent-free green sheet (or "card") of fine powder particles of frit held together with an organic binder containing an essentially water-insoluble thermoplastic synthetic resin can be dimensionally stabilized by a process which utilizes the physical interaction of aquathermic stimuli on the green card. The process includes contacting the card with liquid water or moisture-saturated air or inert gas (which gas, like water, has no noticeable chemical action on the organic binder) at a temperature in the range from about the freezing point (0.degree. C.) to about the boiling point of water (100.degree. C.) and drying the card until essentially all the moisture from within the pores of the cards is removed before the cards are circuitized with metallurgy. The green cards which are then essentially free of both moisture and solvent, are allowed to equilibrate at storage temperature for a period of at least about 10 minutes before being processed further.

Abstract: A selective black coating on aluminum is provided which is characterized by a high absorptivity in the visible and near infrared regions of the spectrum (0.38 to 1.9 microns) and a low emissivity for radiation of longer-(infrared)-wavelength (greater than 6 microns). The black or near black coating is applied by immersing the aluminum in a bath containing soluble borate and silicate salts.