I am writing a book and as part of the plot one of the characters has a plant that contains alkaloids in tincture form. They want to do a test to detect for the alkaloids so they use the Dragendorff's reagent test. Quote below:
Bindweed contains alkaloids. The Dragendorff's reagent is a simple test to detect for them. They had all I needed in the chemistry lab... bismuth nitrate, hydrochloric acid, potassium iodide. When I added milk to the solution it turned orange confirming the presence of alkaloids. I did a control test too and nothing happened.
Would this technically work?