(February 2014) Allusion is a figure of speech, in which one refers covertly or indirectly to an object or circumstance from an external context. It is left to the audience to make the connection; where the connection is directly and explicitly stated (as opposed to indirectly implied) by the author, it is instead usually termed a reference.
Titanium metal connects well with bone, so it has found surgical applications such as in joint replacements (especially hip joints) and tooth implants. The largest use of titanium is in the form of titanium(IV) oxide. It is extensively used as a pigment in house paint, artistsâ paint, plastics, enamels and paper.
For most household projects, a high speed steel drill bit is sufficient. When you're drilling through hardened steel, however, a strong, heat-resistant drill bit is needed. A titanium drill bit is good enough for most home projects. However, if you do a lot of drilling into hardened steel, a cobalt drill bit, although expensive, will provide long-lasting performance.