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I'm a fan of immutable objects for their various benefits. Below is an example of how to make your Ingredient class immutable. Similar techniques can be made to your Formula class. I also highly recommend not using ArrayList in favor of a generic List<Ingredient> as Trust me - I'm a Doctor recommends.

sealed class Ingredient
{
 private readonly string name;
 private readonly decimal percentage;
 private readonly bool isFlour;
 private readonly decimal? weight;
 public string Name { get { return this.name; } }
 public decimal Percentage { get { return this.percentage; } }
 public bool IsFlour { get { return this.isFlour; } }
 public decimal? Weight { get { return this.weight; } }
 public Ingredient(string _Name, decimal _Percent, bool _IsFlour, decimal? _Weight)
 {
 this.name = _Name;
 this.percentage = _Percent;
 this.isFlour = _IsFlour;
 this.weight = _Weight;
 }
}