Today we are going to make a bouncy ball. This experiment is best done by the sink.
What you will need:
Childsafe glue (PVAc)
Borax (be careful, borax is toxic and should not be eaten)
Cornstarch
A tap
Food coloring
A disposable chopstick (for stirring)
A cut-off plastic bottle or disposable plastic cup
A disposable soup spoon (for measuring - holds 20ml)
A cup (for holding the cornstarch)
▲ Put a spoonful of cornstarch into a cup.
▲ Put a spoonful of glue into the bottle. Wash the spoon with warm water. Dry the spoon.
▲ Add a drop of food coloring to the glue. Mix in well.
▲ Measure out an eighth of a spoonful of borax.
Carefully sprinkle the borax evenly over the surface of the glue. Don't stir it!
▲ Add the cornstarch on top of the glue and borax. Do not stir it.
▲ Count to 15.
▲ Using the chopstick, stir the mixture until it is all clinging to the chopstick.
▲ Remove the mixture from the bottle. Place it between your palms. Turn on the cold water tap and roll the mixture into a ball shape underneath the running tap.
▲ When the ball feels firm you can turn off the water. Wait a couple of minutes for the ball to dry out and then try bouncing it! Be careful where you leave your ball - others might mistake it for food. It musn't be eaten! If you want to keep your ball, store it in a ziplock bag.(CATHERINE THOMAS, STAFF WRITER)
今天我們要製作「彈跳球」，這個實驗最好在水槽裡面進行喔！
所需材料︰
兒童專用膠（白膠）
硼砂（請小心，硼砂具有毒性，千萬不要誤食）
玉米澱粉
水龍頭
食用色素
一根免洗筷（攪拌用）
切半的寶特瓶或免洗塑膠杯
免洗湯匙（測量用，容量二十毫升）
杯子（裝玉米澱粉用）
▲ 舀一匙玉米澱粉到杯中。
▲ 再裝一匙的白膠到瓶中。用溫水沖洗湯匙，然後擦乾。
▲ 滴一滴食用色素至白膠中，攪拌均勻。
▲ 準備八分之一匙的硼砂。仔細地將硼砂平均撒在白膠上，先不要攪拌！
▲ 再將玉米澱粉舖在上面，也先不要攪拌。
▲ 默數到十五。
▲ 開始用筷子攪拌，直到所有的東西都黏在筷子上為止。
▲ 將成品從瓶中取出，放在雙掌間。打開水龍頭的冷水，將混合物邊沖水邊搓成一個小球的形狀。
▲ 當小球質地變硬不再黏糊，就把水關起來。等待數分鐘讓小球完全乾了後，就可以測試它的彈跳力了。小心收好彈跳球，以免有人誤食！如果想保持球的彈性，可以把球收在夾鏈袋中。（翻譯：袁星塵）
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