Dye wood, fungi, and lichens. Most dyes are synthetic, i.e., are man-made from petrochemicals. Other than pigmentation, they have a range of applications including organic dye lasers, optical media (CD-R) and camera sensors (color filter array). Textile dyeing dates back to the Neolithic period. Throughout history, people have dyed their textiles using common, locally available materials. Scarce dyestuffs that produced brilliant and permanent colors such as the natural invertebrate dyes Tyrian purple and crimson kermes were highly prized luxury items in the ancient and medieval world. Plant-based dyes such as woad, indigo, saffron, and madder were important trade goods in the
Trooping the Colour year emphasise the Queen's knowledge of the attributes of her guards, and single out "steadiness" as a highly prized quality for a guardsman. The accompanying marches always carry a flavour of the regiment whose colour is being trooped, lending the royal inspection a unique atmosphere. For example, if the Welsh Guards are trooping their colour, the music will include their traditional regimental march, "Men of Harlech". While the Queen passes the six companies of foot guards on her left, a slow march or air is played. Once the phaeton turns around the rear of No. 6 Guard, the music changes