Do you want me to tell you about my favorite colored flash gels? About Selens SE-CG20 Gel Filter Set?
Color gels are most commonly used to change the color temperature of light sources. And also to give the right shade of light for an artistic effect.
Most photographers and amateur photographers are accustomed to using these inexpensive color gel kits:

They are attached to flashlights with the help of such a “device”:

Those. Velcro strip is glued to the flash (Textile Velcro closure), this “device” clings to it, and one or more filters from the set are already installed in it.

These sets are widely used due to their low price, and if you order them on AliExpress, and even with the use of cashback services, then the price of these sets will be very low. And so when I lost a similar set last year, I didn’t really regret it.
And last year, while searching on AliExpress, I found a slightly different set, here is a link to it, well, or you can use the search on AliExpress and you might be able to find a price even lower. (for those who prefer Ebay: they are also there, here are the links, one, second and third, well, or again, you can use the search on Ebay). This kit is also sold as Selens SE-CG20 (both on AliExpress and Ebay).
What is good about this set? This is how it looks like:

As you can see, the entire set consists of a pair of wide rubber bands and 20 of the most commonly used colors to create different color effects:

Five conversions:
- 1/2 CTB (3200K-4300K)
- Full CTO (6500K 3200K)
- 1/2 CTO (6500K 3800K)
- 1/4 CTO (6500K 4600K)
- Plus Green (cc30 green)
One diffuse gel:
- Heavy Frost Diffusion
and 14 color filters:
red-yellow shade:
- Chocolate
- Smokey Pink
- Follies Pink
- Bright Red
- Rust
- Dark Salmon
- Oklahoma Yellow
- Medium Yelow
Blue-green shade:
- deep purple
- Special KH Lavender
- Just Blue
- Medium Blue Green
- steel green
- moss green
How, then, are colored gels attached to the flash? And everything is so simple and banal that it is perhaps better to show.
Let’s take Shanny SN910+ flash (aka Shanny SN600SN)

We will put one of the complete rubber bands on it.

And attach the colored gel to the flash.

As you can see in the photo, colored flash gels completely cover the glass of the flash head, and the size of this glass in Shanny SN910+ is not at all small. After all, the size of these filters is 60x150mm, and the size of the “working area” is 60x70mm, which is enough for on-camera flashes (Powerful hammer flashes Luch-M1 or Metz mecablitz 76 MZ‑5 is a completely different field of berries)
Similarly, you can put a colored gel on a flash with a smaller glass on the flash head, for example, on the Yongnuo YN-560III

So no need to stick anything to the flash, and if today you need to use colored gels on one flash, and tomorrow it becomes necessary to apply them on another, there are no problems, you don’t have to think about how to attach them, you don’t need to re-stick anything or look for Velcro in shops and stalls. In addition, there are additional bonuses: the appearance does not suffer and the trade dress of your flash units is not lost.
And taking into account the fact that there are two such rubber bands in the kit, you can use them on two flashes at once, or even in general, use the same ones instead of complete rubber bands.rubber bands for money”, which can be purchased at almost any stationery store.
Well, of course, this the story will not be complete if you do not show the colored flash gels at work. Let’s take the Xiaomi MI NDY-02-AD 10400mAh power bank, it is in an aluminum case, and therefore looks gray and inconspicuous in the photo:

and put two flashes with blue gel on the left, one will be directed to the background, the other will be turned to illuminate the end of the power bank, and the third flash with orange gel will be directed to the power bank. And here’s what we get:

Well, or one more example of using colored gels for flash. The history of this photo is banal: last year, on the eve of Halloween, friends from the Kharkov quest room “TheDOOR” asked for a pair of my flashes with racks and softboxes for rent, because. they prepared a themed photo corner and wanted to take good photos of their visitors in it, but at that time they had not yet managed to purchase their equipment. Of course, among the other entourage of the photo corner there were also Halloween pumpkins. And although I didn’t have a camera with me, I just couldn’t get past a Halloween pumpkin in a hat and on hay and using someone else’s camera took this shot

If anyone is interested in the technical details of the picture, then they are under the spoiler
Standing on the left in a softbox is a YN650IIV with Just Blue gels and 1/2 CTB (3200K 4300K), and inside the gourd is a YN560III with Bright Red and Rust gels, additionally, for a warmer glow inside the gourd, the white balance on the camera was set to 3130k. “Intra-chamber” jpg, only resize from processing.
But I think it’s worth remembering that flash gels are nothing more than a tool, they can be used for a wide range of purposes. But like any other tool, the use of photo flash gels must be used wisely and skillfully, as a tool for realizing a creative idea, and not as a substitute for it.