what colour is paper towel?

We were doing painting this afternoon and my daughter was doing paint-by-numbers. I explained to her that she should finish painting all the spots with one colour and then wash the brush before moving on to the next colour. She was not using water colours, so I suggested that she use a paper towel to squeeze the brush dry so that it won't be too wet for her paint pots. Later, when I went into the kitchen I saw her dry her brush on a hand towel. I said "I thought I asked you use a paper towel?" She said "We don't have paper towel." When I pointed out the paper towel holder beside the microwave, she said "That's not paper towel - paper towels are brown!" Of course! The paper towel in the washrooms at school and other public places IS brown.