Gradients using alpha transparency

Note: Each end (left and right) of each gradient shows full alpha transparency. The last test for each color range is repeated to show also gradients using the keyword 'transparent' (i.e. 'trans-black ~ yellow ~ trans-black' along with 'transparent ~ yellow ~ transparent' for yellow).

background color (white and then black) under each test
Y1. trans-white ~ yellow ~ trans-white
Y2. trans-yellow ~ yellow ~ trans-yellow
Y3. trans-lime ~ yellow ~ trans-lime
Y4. trans-aqua ~ yellow ~ trans-aqua
Y5. trans-blue ~ yellow ~ trans-blue
Y6. trans-fuchsia ~ yellow ~ trans-fuchsia
Y7. trans-red ~ yellow ~ trans-red
Y8. trans-black ~ yellow ~ trans-black
Y9. transparent ~ yellow ~ transparent
B1. trans-white ~ blue ~ trans-white
B2. trans-blue ~ blue ~ trans-blue
B3. trans-fuchsia ~ blue ~ trans-fuchsia
B4. trans-red ~ blue ~ trans-red
B5. trans-yellow ~ blue ~ trans-yellow
B6. trans-lime ~ blue ~ trans-lime
B7. trans-aqua ~ blue ~ trans-aqua
B8. trans-black ~ blue ~ trans-black
B9. transparent ~ blue ~ transparent
F1. trans-white ~ fuchsia ~ trans-white
F2. trans-fuchsia ~ fuchsia ~ trans-fuchsia
F3. trans-red ~ fuchsia ~ trans-red
F4. trans-yellow ~ fuchsia ~ trans-yellow
F5. trans-lime ~ fuchsia ~ trans-lime
F6. trans-aqua ~ fuchsia ~ trans-aqua
F7. trans-blue ~ fuchsia ~ trans-blue
F8. trans-black ~ fuchsia ~ trans-black
F9. transparent ~ fuchsia ~ transparent
L1. trans-white ~ lime ~ trans-white
L2. trans-lime ~ lime ~ trans-lime
L3. trans-aqua ~ lime ~ trans-aqua
L4. trans-blue ~ lime ~ trans-blue
L5. trans-fuchsia ~ lime ~ trans-fuchsia
L6. trans-red ~ lime ~ trans-red
L7. trans-yellow ~ lime ~ trans-yellow
L8. trans-black ~ lime ~ trans-black
L9. transparent ~ lime ~ transparent
A1. trans-white ~ aqua ~ trans-white
A2. trans-aqua ~ aqua ~ trans-aqua
A3. trans-blue ~ aqua ~ trans-blue
A4. trans-fuchsia ~ aqua ~ trans-fuchsia
A5. trans-red ~ aqua ~ trans-red
A6. trans-yellow ~ aqua ~ trans-yellow
A7. trans-lime ~ aqua ~ trans-lime
A8. trans-black ~ aqua ~ trans-black
A9. transparent ~ aqua ~ transparent
R1. trans-white ~ red ~ trans-white
R2. trans-red ~ red ~ trans-red
R3. trans-yellow ~ red ~ trans-yellow
R4. trans-lime ~ red ~ trans-lime
R5. trans-aqua ~ red ~ trans-aqua
R6. trans-blue ~ red ~ trans-blue
R7. trans-fuchsia ~ red ~ trans-fuchsia
R8. trans-black ~ red ~ trans-black
R9. transparent ~ red ~ transparent