Method of enhancing footwear impression on porous surfaces using potassium ferrocyanide solution for footwear impression enhancement

A method of enhancing a footwear impression formed on a porous surface using a potassium ferrocyanide solution for footwear impression enhancement, the method comprising:

• forming a porous surface sample by leaving footwear impressions into an object having a porous surface;
• preparing a potassium ferrocyanide solution for footwear impression enhancement, wherein the preparing of the potassium ferrocyanide solution includes mixing an aqueous solution of potassium ferrocyanide and hydrochloric acid;
• and
• applying the potassium ferrocyanide solution for footwear impression enhancement to the porous surface sample.