When you are preparing orange and lemon squash you should not boil the juice.
Just boil the sugar syrup and when it is cooled mix it with the juice.

ORANGE SQUASH :
INGREDIENTS

orange juice: 1 litre,
sugar: 1.7 litres,
water: 1.3 litres,
citric acid: 20 g [4 teaspoons],
colour: orange,red,
K.M.S: 3.2 g,
essence: 20 ml.

PROCEDURE:
when you are preparing orange juice you should not use iron utensils.
squeeze the oranges, extract the juice and filter it.
prepare sugar syrup, filter it and allow it to cool.
when cooled mix the syrup and juice and add the preservative,colour and essence and store it in sterilised bottles.