This will look like Harpic. It has the same amount of acid as Harpic. But it does not have all the other ingredients that Harpic has.
The concentration of the acid you use is very important. This will affect the consistency. So, you should first try one or two small batches to get the right Consistency.
Do not add perfume to this. If you do, the layers will separate.
 
List of raw materials used in this formula:
Citric Acid
Acid Blue colour (1% Solution)
HCl - Acid (28%)
Acid Thickener