英文關鍵字
ash
background
base
black
bowl
caustic
chemical
chemistry
chloride
cleaning
coal
compound
danger
detergent
dry
erode
flake
glass
handicraft
handmade
hydrated
hydroxide
industrial
ingredient
ingredients
inorganic
lye
making
manufacturing
material
naoh
natural
nature
nobody
object
peel
potassium
powder
powdered
reaction
scale
soap
soda
sodium
solid
substance
wash
white