Abstract: A process for producing encapsulated metal colloids useful as inorganic colored pigments, including, reacting one or more glass-forming components according to the sol-gel process to obtain a sol dispersing a metal salt in the resulting sol in the presence of an additional reducing agent to form metal colloids, converting the resulting dispersion into xerogel-encapsulated metal colloids by spray drying, heating the resulting xerogel-encapsulated metal colloids to density them. The present invention relates, furthermore, to inorganic colored pigments, in particular producible by the process of the invention, including metal colloids produced from metal salts and encapsulated in an encapsulation, the encapsulation being produced from glass-forming components according to the sol-gel process and being densified to a xerogel or glass, the proportion of metal colloid in the capsules being at least 80%.

Abstract: A process for producing encapsulated metal colloids useful as inorganic coloured pigments, including, reacting one or more glass-forming components according to the sol-gel process to obtain a sol dispersing a metal salt in the resulting sol in the presence of an additional reducing agent to form metal colloids, converting the resulting dispersion into xerogel-encapsulated metal colloids by spray drying, heating the resulting xerogel-encapsulated metal colloids to density them. The present invention relates, furthermore, to inorganic coloured pigments, in particular producible by the process of the invention, including metal colloids produced from metal salts and encapsulated in an encapsulation, the encapsulation being produced from glass-forming components according to the sol-gel process and being densified to a xerogel or glass, the proportion of metal colloid in the capsules being at least 80%.

Abstract: An adjustable pistol grip for a competition rifle or the like having three basic embodiments. In one embodiment, balls and sockets are located in the pistol grip and stock or body of the rifle. The balls and sockets are connected by a rod which is adjustably clamped either by a hydraulic piston, screw ring or expanding ball, in the socket. The connecting rod may be two part, each displaceably clampable relative to the other. Another embodiment employs a flexible wire fixed to the stock and pistol grip. On the wire are perforated balls alternating with short cylinders and a screw or lever which can apply tension to the array to hold the pistol grip required in any position in relation to the stock. Another embodiment employs a universal joint, one member of which is rigidly fixed to the pistol grip or stock, and the other member of which is rigidly fixed to a rod which is adjustably held in a mount supplied with a clamp.