Tests

• Iodine tests for starch
• Negative iodine test


  brown
• positive iodine


  dark purple
• biuret tests for proteins
• negative biuret test


  royal blue
• positive biuret test


  violet/purple
• benedict's test needs to be heated
• benedict's tests for reducing sugars
• negative benedict's test


  aqua blue
• positive benedict's test


  green, orange, or red (closer to red = greater sugar concentration)
• sudan tests for fats
• negative sudan test


  no fat globules
• positive sudan test


  red boundary around fat globules