In borax bead test, copper forms a ............. coloured bead in oxidising flame and a .............. coloured bead in reducing flame.

Explanation

To answer the question regarding the colors of the beads formed by copper in the borax bead test, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Borax Bead Test**:
The borax bead test is a qualitative analysis method used to detect certain metals based on the color of the bead formed when a metal salt is heated in a flame with borax.

2. **Heating Borax**:
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