Prepare moulds first by greasing with cooking oil, butter, lard etc. Wipe out excess spray with paper towel. (Some moulds only need to be greased after every two to three uses). If you are using open moulds, use a marble slab or a new cookie sheet turned over so you set up the moulds on the bottom. Cover the pouring surface with tin foil and you will not need to put oil on it. Center sticks in moulds.
Mix all ingredients listed above in a one qt. glass pitcher or bowl (Pyrex). Cook on high for three minutes. Remove and stir. Cook for an additional three minutes; remove and stir. Start checking temperature with a thermometer when stirring the mixture the third or fourth time. Continue to check with each subsequent stirring. Continue cooking until mixture reaches 300 - 305 degrees, F. Total cooking time is approximately 16 to 20 minutes. Proceed with rest of recipe.
Work fast. Allow standing time until bubbles have settled down (approximately 265 degrees F). Add the flavour according to the recipe. Then add the colouring. Go easy as too much colour can make the lollipops taste bitter. In addition, too much flavour will make the lollipops taste soapy.
Stir until blended. Citric acid is also added at this time to fruit flavoured lollipops to enhance the taste. Be careful, as too much stirring will cause the syrup to solidify into a hard sugar lump.
Once the candy solution is well blended, start pouring into the moulds. Right after all the moulds are full and the lollipops are still hot, you can add candy decorations and they will readily stick to the pop. Alternatively, you can add any commercially made candy to the top surface of the lollipop. If the lollipops cool too much, just add a drop or more of corn syrup to the back of the piece of candy and it will stick to the pop. Always be sure to keep any unprotected hands from touching the hot surface of the lollipop, it will burn.
Allow to set until hardened which should take between five and 10 minutes to cool depending on air temperature, humidity, the surface the moulds are set up on, etc. You can also refrigerate until firm, but do not leave lollipops there.
Remove lollipops from moulds by raising the stick and lifting candy out. The moulds for simple shapes like the small rounds release very easily. More intricate shaped moulds like the car or train moulds may take a little coaxing to remove from the lollipop. Always be careful not to force the mould open too much as this will decrease the useful life if the mould.
Place in plastic sucker bags and tape shut or wrap each lollipop in plastic wrap. Store in a cool, dry place.