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扎染漂亮小手帕（第一課時(shí)）
年 級(jí)：三年級(jí) 學(xué) 科：勞動(dòng)
什么是扎染？
扎 染
扎染是中國(guó)傳統(tǒng)手工染色工藝，也是國(guó)家非物質(zhì)文化遺產(chǎn)之一。扎染是在染色時(shí)將織物部分扎結(jié)起來(lái)，染色后就會(huì)形成各種花紋。
純天然
植物染料
扎染還需要用到哪些工具？
學(xué)習(xí)制作過(guò)程和方法
對(duì)稱、有規(guī)律
折疊大比拼
請(qǐng)同學(xué)們嘗試用一張白色的小方帕進(jìn)行折疊，數(shù)一數(shù)你會(huì)幾種折法？看一看誰(shuí)的折法更多？
規(guī)則：
學(xué)習(xí)折法
學(xué)習(xí)折法
對(duì)折法
輻射法
？
扎法：不同的捆扎方式會(huì)出現(xiàn)不同的暈染紋樣。
你們學(xué)到了哪些扎結(jié)方法？
長(zhǎng)條分段扎結(jié)法
中心點(diǎn)分段扎結(jié)法
三角形扎結(jié)法
五角星扎結(jié)法
豆點(diǎn)圖案扎結(jié)法
皮筋扎法
彈珠扎法
木板扎法
學(xué)習(xí)染法
浸染法
滴染法
圖
(1)扎染的染料—
植物染料
1藍(lán)·藍(lán)草
3人
黃·梔子
染料叫藍(lán)。凡可制取靛青（即靛藍(lán)）的植物，皆可稱
古代用酸性來(lái)控制梔子染黃的深淺，欲得深黃色，則增加染中
“藍(lán)”。靛藍(lán)的粗制浮沫即中藥青黛.藍(lán)草的根即著名中
藥板藍(lán)根，其果為中藥藍(lán)實(shí)。它們皆有殺菌消炎，清熱解毒
酷的用顯。用梔子浸液可以直接染織物成鮮艷的黃色，工藝簡(jiǎn)
之藥效，可用于防治流腦、流感及肝炎等傳染疾病。
單，但梔子染黃耐日曬的能較差，因此自宋以后染黃又被槐花
部分取代。
2紅·茜草
4粉·蘇木
茜草是一種歷史悠久的植物染料，古時(shí)稱茹蔗、地
血，早在商周的時(shí)候就已經(jīng)是主要的紅色染料。
蘇木是蘇木科蘇木屬的植物，具有活血祛瘀、消腫止痛的作用
·染色茜草(Rubia tinctorum L.),根含茜草素
蘇木內(nèi)含有蘇木紅色素，是我國(guó)古代若名的紅色系染料。
多生于沙地上
5瓶靛青藍(lán)
村
靛青藍(lán)
靛青藍(lán)
靛青藍(lán)
靛青藍(lán)
dye
dye
t-dye
dye
靛青藍(lán)
tie-dye
om位
erng Chiies
eng Co
O
0g
N CHFNA
用0
有0
HADE INCHINA
AD
X
這些都是對(duì)稱現(xiàn)象。你
還見(jiàn)過(guò)哪些對(duì)稱現(xiàn)象？
1
剪一剪。
像上面這樣，先把一張紙對(duì)折，再畫(huà)一畫(huà)、剪一剪。
Y車B
對(duì)稱軸
像這樣剪出來(lái)的圖形都是對(duì)稱的，它們都是軸對(duì)稱
圖形。
做一做
下面哪些圖形是軸對(duì)稱圖形？在()里畫(huà)“√”。
29
eir time.While Washington and Jefferson privately expressed dst
s anew slavery wns wrngand yet most did little to fight it
they also understood that it was part of the political and econon e
red by the
e country they helped to create.
ed distast園
of the country
cconomic
thing,the South
ot
afford to pa
ike having
slaves.Own one thing.the
ar
cek,author ofslik havin
es.Owning
George
ation of Amer
God:George
uthor of An
ates wo
of America.
ned
em states wou
stitution,
otections for
that
orotectionar institution
rposes of co
as three fr purposes
three fifths
0
sent
e statesme
atesmen's
lives ependea
slavery.The three-led Jefferse
three-fifths
efferson his na.w victory in the presidential election of 18wotes of t
n of 1800 by
of the southern states in the Electoral College.Once in onded sla
ce in office,
slavery with the Louisiana Purchase in 1803;the new lan states,ree save states.
ew land was
es,including three slave states.
erson freed Hemings's children-though not Hemings herself or his
n freed Hemings's children-though not Hemings hersein the bravery of the blackson
50 other slaves.Washington,who had begun to believe that al
other slaves.Washington,who had begun to believey War,overcame the strong opposition of his relatives to gran
qual after observing the bravery of the black soldiersreedom in his will.Only a decade earlier,such an act woul
Var,overcame the strong opposition of his relatives islative approval in Virginia.
otheyBt cenmanyn ave
11
八1
1 ysce-cmoppntg【e0em
.......veceny,many nistorians have
n to focus on the mle slavery played in the lives of the founding generation.
n to focus on the role slavery played in the lives of the founding generation.
have heen spurred in part by DNA evidence made available in 1998,which
have been spurred in part by DNA evidence made available in 1998,which
certainly proved Thomas Jefferson had fathered at least one child with his
certainly proved Thomas Jefferson had fathered at least one child with his
Sally Hemings.And only over the past 30 years have scholars examined
ally Hemings.And only over the past 30 years have scholars examined
from the bottom up.Works of several historians reveal the moral
from the bottom up.Works of several historians reveal the moral
mises made by the nation's early leaders and the fragile nature of the
s infancy.
nises made by the nation's early leaders and the fragile nature of the
new slaver
Founding
infancy.More significantly,they argue that many of the Founding
e than anyt
new slavery was wrong-and yet most did little to fight it.
their time.
ered by the
than anything,the historians say,the founders were hampered by the
they als
ssed distaste
their time.While Washington and Jerson privately expressed distast
the countr
nd economic
they also understood that it.
e thing,
the country they helped t
the political and economi
“l(fā)ike havi
ives.Owning
thing,the South
author of An
like having a large
its slaves.Ownir
d:George
states wo
of America.
1:George Washingu
author of A
institutio
rotections for
states would not have
tion of Americ
ourposes
three fifths
nstitution,"including a
nthout protections
ed a slave as three fif
statesme
Jeffers
three-fifths
irposes of congressional rep.
es of tl
n of 1800 by
tatesmen's political lives depd on slavery.The three-fi
ce in office,
ed slavery win tne Louisiana Purchase in 1803;the new land was
Jefferson his narrow victory in the presidential election of 1800
ates,including three slave states.
s of the southern states in the Electoral College.Once in off
on freed Hem
d slavery with the Louisiana Purchase in 1803:the new land

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