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2. Hair coloring - Wikipedia

   en.wikipedia.org/wiki/Hair_coloring

   A woman with dyed pink hair. Hair coloring, or hair dyeing, is the practice of changing the color of the hair on humans' heads.The main reasons for this are cosmetic: to cover gray or white hair, to alter hair to create a specific look, to change a color to suit preference or to restore the original hair color after it has been discolored by hairdressing processes or sun bleaching.

3. 1951 USAF resolution test chart - Wikipedia

   en.wikipedia.org/.../1951_USAF_resolution_test_chart

   A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens. It is widely used in optical engineering laboratory work to analyze and ...

4. List of medical roots, suffixes and prefixes - Wikipedia

   en.wikipedia.org/wiki/List_of_medical_roots...

   having a grey color Greek πολῐός (poliós), grey, grizzled poliomyelitis: poly-denotes a 'plurality' of something Greek πολῠ́ς (polús), many, a lot of, large, great polymyositis: por-pore, porous Greek πόρος (póros), passage, passageway pore porphyr-denotes a purple color Greek πορφύρα (porphúra), Tyrian purple ...

5. Civil defense Geiger counters - Wikipedia

   en.wikipedia.org/wiki/Civil_defense_Geiger_counters

   Civil defense Geiger counters. Geiger counter is a colloquial name for any hand-held radiation measuring device in civil defense, but most civil defense devices were ion-chamber radiological survey meters capable of measuring only high levels of radiation that would be present after a major nuclear event. Most Geiger and ion-chamber survey ...

6. Winkler titration - Wikipedia

   en.wikipedia.org/wiki/Winkler_titration

   The Winkler test is used to determine the concentration of dissolved oxygen in water samples. Dissolved oxygen (D.O.) is widely used in water quality studies and routine operation of water reclamation facilities to analyze its level of oxygen saturation. In the test, an excess of manganese (II) salt, iodide (I −) and hydroxide (OH −) ions ...

7. Perrhenate - Wikipedia

   en.wikipedia.org/wiki/Perrhenate

   The perrhenate ion is the anion with the formula ReO−. 4, or a compound containing this ion. The perrhenate anion is tetrahedral, being similar in size and shape to perchlorate and the valence isoelectronic permanganate. The perrhenate anion is stable over a broad pH range and can be precipitated from solutions with the use of organic cations.

8. The 6 Best Print-on-Demand Sites for Artists in 2021 - AOL

   www.aol.com/6-best-print-demand-sites-140053132.html

   Print-On-Demand Companies. In this guide, we will review these six print-on-demand sites: Zazzle. CafePress. Society 6. RedBubble. TeePublic. INPRNT. What to Watch Out for When Choosing a Print-On ...

9. Iodine clock reaction - Wikipedia

   en.wikipedia.org/wiki/Iodine_clock_reaction

   The iodine clock reaction is a classical chemical clock demonstration experiment to display chemical kinetics in action; it was discovered by Hans Heinrich Landolt in 1886. [1] The iodine clock reaction exists in several variations, which each involve iodine species (iodide ion, free iodine, or iodate ion) and redox reagents in the presence of ...