Icing for Biscuits (Royal Icing)

Bahan-bahan (60 porsi)

• 500 g / 1 lb PURE icing sugar / powdered sugar (, sifted (plus extra for adjusting) (Note 1))
• 1/4 cup egg whites ((~3 eggs) (Note 2))
• 2 tbsp corn syrup ((or 1.5 tbsp glucose syrup, Note 3))
• 1 - 1 1/2 tbsp water (, plus more as needed)
• Food Dye - liquid or gel (, go by eye for quantity (Note 4))