Apple store logos around the world are turning red.

The transition from gray to a more crimson hue started Thursday in Australia and continues around the world through tomorrow.

It's not a permanent change (it lasts for a week). Instead, it's just one more signal that Apple is once again participating in World AIDS Day (December 1).

The company announced on Thursday that, along with the logo change at its hundreds of retail locations around the world, Apple will be making donations to the (RED) program, which feeds money to The Global Fund, a non-profit that provides grants for fighting the spread of HIV/AIDs in 8 African nations.

Starting Friday, Apple will donate $1 for every Apple Pay purchase made at retail and in apps. Good news for the fund, but Apple will also limit the fundraising efforts to customers who actively use Apple Pay. If you've been avoiding these device-enabled payment systems, this might be a good reason to try it out.

Over the past year, Apple reports donating $30 million to the Global Fund, at least some of it generated through Product (RED) products like the (RED) iPhone 7 and 7 Plus handsets introduced in March. At the time, (RED) CEO Deb Dugin told Mashable, "This is the biggest day in our 10-year partnership." According to (RED), they've raised $475 million and reached over 90 million people since launching the non-profit over a decade ago.

For this World AIDS Day, Apple has also partnered up with third-party app provider King. If you're addicted to Candy Crush Saga, then you can blame King, it makes that addictive game along with Candy Crush Jelly Saga, and Candy Crush Soda Saga. Proceeds from in-app purchases will also go to The Global Fund.

Apple is also using its redesigned App Store to support its World AIDS Day efforts, populating its Today Tab with stories about the on-going, worldwide fight against HIV/AIDS.

You can learn more about World AIDS Day here.