Which statement about the Weil technique is true?

• A. It uses only a mordant
• B. It uses both excess mordant and an oxidizer
• C. It uses copper in impregnation
• D. It is a silver stain

Answer: (B)

The Weil technique is a silver impregnation method that relies on forming a silver-mordant complex and then developing it to metallic silver. It uses excess mordant to provide abundant binding sites and includes an oxidizer in the development step to drive the deposition of silver and reduce background. This combination—both an excess mordant and an oxidizer—is what makes the Weil method distinct. While it is a silver stain, the defining feature is the need for both components during development, not just a mordant or a simple copper impregnation.