Question

iodine test for starch
a positive result when using iodine is...
amber
red/organe
blue black

Explanation:

The iodine test is a common method in chemistry to detect starch. When iodine reacts with starch, it forms a complex that results in a characteristic blue - black color. This is a well - known chemical reaction. The other colors (amber and red/orange) do not indicate the presence of starch in the context of the iodine test.

Answer:

blue black