Many researchers run into the same questions:
🔹 “Which dye matches my instrument channel?”
🔹 “I need red or green fluorescence — what should I choose?”
🔹 “How do I avoid signal overlap and wasted experiments?”

The good news: selecting a fluorescent dye often comes down to just **3 key factors**:

✅ **Instrument channel** – What laser/excitation source does your instrument use? (405 nm, 488 nm, 561 nm, 640 nm, etc.)

✅ **Excitation/Emission wavelength** – The dye must be efficiently excited and detected within your instrument's range.

✅ **Fluorescence color** – The visible output that helps distinguish your targets.

The workflow is simple:

1️⃣ Confirm your instrument laser/channel
2️⃣ Match the dye excitation wavelength
3️⃣ Choose the fluorescence color you need

A quick guide:

🔵 **UV–Blue region (350–450 nm)**
Blue fluorescence
Examples: DAPI, Hoechst 33258, Hoechst 33342

🟢 **Green region (480–520 nm)**
Green fluorescence
Examples: FITC/FAM, GFP/EGFP, Alexa Fluor 488, Oregon Green 488

🟡 **Yellow–Orange region (540–580 nm)**
Yellow/Orange fluorescence
Examples: TRITC/TAMRA, Alexa Fluor 546, Alexa Fluor 555, Rhodamine 6G

🔴 **Red region (580–630 nm)**
Red fluorescence
Examples: Alexa Fluor 594, Texas Red, MitoTracker Red, PI

⚫ **Far-red/Near-IR region (630–780 nm)**
Far-red/NIR fluorescence
Examples: Cy5, Alexa Fluor 647, Cy5.5, Cy7

Understanding the relationship between **channel → wavelength → color** can save time, reduce troubleshooting, and improve experimental success.

What fluorescent dye do you find yourself using most often in your experiments?