A fluorescent fixture refers to a type of lighting structure designed to accommodate fluorescent light bulbs or tubes. These fixtures provide the necessary electrical connections allowing the bulbs to emit light when electricity is applied. This type of lighting is often used in commercial and residential settings due to its energy efficiency and long lifespan. Fluorescent fixtures come in a variety of forms - they can be mounted on ceilings or walls, or designed as free-standing lamps for desks or work areas.

To fiddle with something means to handle or manipulate it aimlessly, often in a restless or nervous manner, or to repeatedly make minor adjustments or alterations to it.

Mosaic gold is a type of pigment, a brilliant yellow or golden colored powder that is made from tin sulfide. Its mainly used to imitate gold leaf in mosaics, hence the name. Its also employed in decorations and artistic endeavors such as glass painting and ceramics. Due to its toxicity, it is not generally used today.

Roccella tinctoria is a species of fruticose lichen in the Roccellaceae family. It is native to the Mediterranean and known for its importance in the production of the purple-red dye called orchil (or orcein). The lichen is also known as litmus fungus and commercially used in litmus paper production.