This is a set a of knives that was made famous in spain through Spain in Ascanio’s unsurpassable book NAVAJAS Y DALTONISMO!
The Effect consists of a white knife visibly changing into red as it passes through the fingers. The Exceptional clarity of execution makes it a very strong illusion.
Juan Tamariz uses it in his TV Appearances in combination with another knife that changes color in the spectator’s hand. The Full routine in included in his book SONATA.
Incredibly well made.