private var enable : boolean;
private var txt : String;

function Star(){
	enable = false;
	txt = "";
}

function  OnCollisionEnter (col : Collision) {
	if(col.collider.GetComponent(Properties) && gameObject.GetComponent(Properties)){ //If the objects contain chemical properties
		var oneProperties = gameObject.GetComponent(Properties);
		var twoProperties = col.collider.GetComponent(Properties);
		
		if(oneProperties.ph < 7 && twoProperties.ph > 7){//Acid + Base...
			txt = "Acid + Base";
		}
		else if(oneProperties.ph > 7 && twoProperties.ph < 7){//Base + Acid...
			txt = "Base + Acid";
		}
		
		enable = true;
		yield WaitForSeconds(2.0);
		enable = false;
	}
}

function OnGUI () {
	if (enable){
		GUI.Label (Rect (Screen.width/2 - 50, Screen.height/2 - 10, 100, 20), txt, "box");
		}
}