Friday, March 20, 2020
Sharpie Pen Tie Dye - Use Science to Create Wearable Art
Sharpie Pen Tie Dye - Use Science to Create Wearable Art Normal tie dye can be messy and time-consuming. You can get a really cool tie-dye effect using colored Sharpie pens on a t-shirt. This is a fun project that even young kids can try. Youll get wearable art and may learn something about diffusion and solvents. Lets get started! Sharpie Pen Tie Dye Materials colored Sharpie pens (permanent ink pens)rubbing alcohol (e.g., 70% or 90% isopropyl alcohol)white or light-colored cotton t-shirtplastic cup Let's Do Tie Dye! ... except you dont have to tie anything. Smooth a section of the shirt over your plastic cup. You can secure it with a rubber band if you want.Dot a Sharpie to form a circle in the center of the area formed by the cup. You are aiming for a dotted ring about 1 in diameter. You can use more than one color.Drip rubbing alcohol on the blank center of the circle. I used the extremely low-tech method of dipping a pencil in the alcohol and dotting it on the shirt. After a few drops, you will see the alcohol spread outward from the center of the ring, taking the Sharpie ink with it.Continue adding drops of alcohol until you are satisfied with the size of the pattern.Allow a couple of minutes for the alcohol to evaporate before moving on to a clean section of the shirt.It doesnt have to be a circle. You can make stars, triangles, squares, lines... be creative!After your shirt is completely dry (alcohol is flammable, so dont use heat on a damp shirt), set the colors by tumbling the shirt in a hot clothes dryer for ~15 minutes.You can wear and wash your new shirt like other clothes now. How It Works The ink in a Sharpie pen dissolves in alcohol but not in water. As the shirt absorbs the alcohol, the alcohol picks up the ink. You can get new colors when different colors of ink mix together. The wet ink will diffuse, or move from areas of higher concentration to lower concentration. When the alcohol evaporates, the ink dries. Sharpie pen ink doesnt dissolve in water, so the shirt can be washed. You can use other types of permanent markers, but dont expect great success using washable markers. Theyll dissolve in the alcohol to make the tie-dye pattern, but theyll also lose color as soon as you wash them.
Wednesday, March 4, 2020
Timeline of the Andean Cultures of South America
Timeline of the Andean Cultures of South America Archaeologists working in the Andes traditionally divide the cultural development of the Peruvian civilizations into 12 periods, from the Preceramic period (ca 9500 BC) through the Late Horizon and into the Spanish conquest (1534 CE). This sequence was initially created by archaeologists John H. Rowe and Edward Lanning and it was based on the ceramic style and radiocarbon dates from the Ica Valley of the South Coast of Peru, and later extended to the whole region. The Preceramic Period (before 9500ââ¬â1800 BC), literally, the period before pottery was invented, spans from the first arrival of humans in South America, whose date is still debated, until the first use of ceramic vessels. The following eras of ancient Peru (1800 BC-AD 1534) have been defined by archaeologists using an alternation of so-called ââ¬Å"periodsâ⬠and ââ¬Å"horizonsâ⬠which end with the arrival of the Europeans. The term ââ¬Å"Periodsâ⬠indicates a timeframe in which independent ceramic and art styles were widespread across the region. The term ââ¬Å"Horizonsâ⬠defines, in contrast, periods in which specific cultural traditions managed to unify the whole region. Preceramic Period Preceramic Period I (before 9500 B.C.E.): First evidence of human occupation of Peru comes from groups of hunters of this tradition are the Chivateros (I) industry and the long and narrow Paijan points. Other important sites are Ushumachay, Telarmachay, Pachamachay.Preceramic Period III (8000ââ¬â6000 B.C.E.): From this period, it is possible to recognize different cultural tradition, such as the Northwestern Tradition, where the site of Nanchoc dates to ca 6000 BC, the Paijan Tradition, the Central Andean Tradition, whose widespread lithic tradition has been found in many cave sites, such as the famous Lauricocha (I) and Guitarrero caves, and, finally, the Atacama Maritime Tradition, at the border between Peru and Chile, where the Chinchorro culture developed about 7000 years ago. Other important sites are Arenal, Amotope, Chivateros (II). Preceramic Period IV (6000ââ¬â4200 B.C.E.): The hunting, fishing and foraging traditions developed during the previous periods continue. However, toward the end of this period, a climatic change allows for early plant cultivation. Important sites are Lauricocha (II), Ambo, Siches.Preceramic Period V (4200ââ¬â2500 B.C.E.): This period corresponds to a relative stabilization of the sea level along with warmer temperatures, especially after 3000 BC. Increase in domesticated plants: squashes, chili peppers, beans, guavas and, most of all, cotton. Important sites are Lauricocha (III), Honda.Preceramic Period VI (2500ââ¬â1800 B.C.E.): The last of the Preceramic periods is characterized by the emergence of monumental architecture, population increase, and widespread production of textiles. Different cultural traditions are recognizable: in the highlands, the Kotosh tradition, with the sites of Kotosh, La Galgada, Huaricoto, and along the coast, the monumental sites of Caralà S upe / Norte Chico tradition, including Caral, Aspero, Huaca Prieta, El Paraiso, La Paloma, Bandurria, Las Haldas, Piedra Parada. Initial through Late Horizon Initial Period (1800 ââ¬â 900 B.C.E.): This period is marked by the appearance of pottery. New sites emerge along the coastal valleys, exploiting the rivers for cultivation. Important sites of this period are Caballo Muerto, in the Moche valley, Cerro Sechin and Sechin Alto in the Casma valley; La Florida, in the Rimac valley; Cardal, in the Lurin valley; and Chiripa, in the Titicaca basin.Early Horizon (900 ââ¬â 200 B.C.E.): The Early Horizon sees the apogee of Chavin de Huantar in the northern highland of Peru and the successive widespread of the Chavin culture and its artistic motifs. In the South, other important sites are Pukara and the famous coastal necropolis of Paracas.Early Intermediate Period (200 B.C.E. ââ¬â600 C.E.): The Chavin influence wanes by 200 BC and the Early Intermediate period sees the emergence of local traditions like the Moche, and Gallinazo in the north coast, the Lima culture, in the central coast, and Nazca, in the south coast. In the northern highlands, the Marcahuamachuco and Recuay traditions arose. Huarpa tradition flourished in the Ayacucho basin, and in the southern highlands, Tiwanaku arose in the Titicaca basin. The Middle Horizon (600ââ¬â1000 C.E.): This period is characterized by climatic and environmental changes in the Andean region, brought about by cycles of droughts and El Nià ±o phenomenon. The Moche culture of the north underwent a radical reorganization, with the move of its capital farther north and inland. In the center and south, the Wari society in the highland and Tiwanaku in the Titicaca basin expanded their dominion and cultural traits to the whole region: Wari toward north and Tiwanaku toward the southern zones.The Late Intermediate Period (1000ââ¬â1476 C.E.): This period is signified by a return to independent polities governing different areas of the region. In the north coast, the Chimà º society with its huge capital Chan Chan. Still on the coast the Chancay, Chincha, Ica, and Chiribaya. In the highland regions, the Chachapoya culture arose in the north. Other important cultural traditions are the Wanka, who opposed a fierce resistance to the first expansion o f the Inca.Late Horizon (1476ââ¬â1534 C.E.): This period spans from the emergence of the Inca empire, with the expansion of their dominion outside the Cuzco region until the arrival of the Europeans. Among important Inca sites are Cuzco, Machu Picchu, Ollantaytambo.
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