Bernie Sanders supporters, beware. A meme has been going around sites like Tumblr and Reddit telling you how to make Sanders glow sticks — but in reality, it's a recipe for a bomb.

The instructions tell you to combine a pool-chlorinating tablet with isopropyl alcohol. As many people — like this DeviantArt user [1] — are now pointing out, this is a dangeous, even deadly, formula for an explosive.

Just look at this YouTube video of what a chlorine bomb looks like:

It's hard to pinpoint the exact origin of the meme, but one of the first posts about it, discovered by Snopes.com [2], was on the /pol/ section [3] of the website 4chan in March 2016.