11 As part of their composition, all permanent haircolor products and lighteners contain both a developer and __ a. an acidic agent b. a decomposing agent an alkalizing agent d. a neutralizing agent

## Step 1<br />The problem is about the composition of permanent hair color products and lighteners. These products are used in hair coloring processes and contain a developer. The developer is responsible for the actual color change in the hair.<br /><br />## Step 2<br />The developer works in conjunction with another agent to ensure the hair color process is effective. The options provided are an acidic agent, a decomposing agent, an alkalizing agent, and a neutralizing agent.<br /><br />## Step 3<br />Among these options, the alkalizing agent is the one that works in conjunction with the developer. The alkalizing agent helps to open up the hair cuticle, allowing the developer to penetrate the hair shaft and deposit the color.