Cirriform clouds tend to be wispy and are mostly transparent or translucent. Flip-flops can be either simple (transparent or opaque) or clocked (synchronous or edge-triggered). JavaScript imposes an advertisement over a webpage in a transparent layer. The memristors are mechanically flexible, optically transparent and produced at low cost. The film which consisted of flexible and transparent celluloid could record split second pictures. The sheets are up to about 95% transparent and conductive. Gems cut from transparent material are fragile. Alternative optical techniques have been proposed for handling perfectly transparent and specular objects. A bubble is made of transparent water enclosing transparent air. This also allows Paint to use transparent backgrounds. Dark field microscopy is a technique for improving the contrast of unstained, transparent specimens. Variations in moveable, removable and transparent roof panels continued. This involved animating moving objects on transparent celluloid sheets. It provided analysis and recommendations on making this process more transparent and accountable. The refractive index of most transparent materials decreases with increasing wavelength.