It's really hard to find exact details about paint and paint information. Showa era paint manufacturers did not create ways to accurately preserve information on colours - particularly during changes in paint technology. One example is mixing values for lacquer paint colours that can't carry over to urethane paint. I'm trying to comprehensively list as much information as I find (much of which may be inaccurate), but there may be errors. If you have information, please let me know.

  1968 - C10
* Skyline Green Metallic
* Skyline Blue Metallic
* Skyline Gold Metallic
* Skyline Red
* Skyline White
 
  1968 - GC10 - 2000GT
* GT Silver Metallic
* GT White
* GT Red

  1969 - PGC10 - Skyline GT-R
* GT Silver Metallic (#700 Glare Silver Metallic)
* GT White (#501 White)
* GT Red (#184 Glow Red)
 
  1969 - PC10, WPC10, VPC10 - 1800 Series
  Skyline Green Metallic
  Skyline Gold Metallic (#253 Twilight Gold Metallic)
  Skyline White (#913 Thunder White)
  Skyline Yellow
  Skyline Blue Metallic (#577 Fine Blue Metallic)
  Skyline Silver Metallic
  Skyline Red
  Skyline Light Blue - Standard only - (#673 Stratosphere Blue)
  
  1969 - C10 - 1500 Series
  
  

Paint Mixing Chart from Repair Section of Maintenance Manual:

Kansai Paint Primary Colors

#1253 Twilight Gold Metallic

• 38-279-020 Metallic Base II… 68%
• 38-279-014 Ochre… 15%
• 38-279-016 Deep Black… 10%
• 37-279-145 Indian Red… 7%

#1577 Fine Blue Metallic

• 38-279-020 Metallic Base II… 43%
• 37-294-147 Royal Blue Conch?… 35%
• 38-279-016 Deep Black… 15%
• 37-279-145 Indian Red… 7%

#1706 Mizzle Grey Metallic

• 38-279-020 Metallic Base II… 63%
• 38-279-016 Deep Black… 25.2%
• 37-279-146 First Blue… 6.3%
• 38-279-015 Maroon… 4.7%
• 38-279-014 Ochre… 0.3%

#0224 Gozama Beige

• 37-194-290 White… 67%
• 37-194-293 Ochre… 13%
• 37-194-291 Black… 10%
• 37-194-295 Indian Red… 7%
• 37-194-294 First Blue… 3%

#0673 Stratosphere Blue

• 37-194-290 White… 45%
• 37-194-294 First Blue… 35%
• 37-194-291 Black… 10%
• 37-194-293 Ochre… 5%
• 37-194-295 Indian Red… 5%

Same manual, different paint:

# 709 Reef Metallic

• 404820 Silver Base (B)… 92.1%
• 404606 Oxide Yellow… 4.2%
• 404204 Chinching (?) Black… 2%
• 404518 Shanin(?) Blue… 1.2%
• 404402 Indian Red… 0.5%

#0154 Glow Red

• 404402 Indian Red… 43%
• 401320 Lake Red S(?)… 32%
• 405308 Wine Maroon… 22%
• 401100 White… 3%

#0912 Thunder White

• 401100 White… 97.3%
• 404204 Chinching (?) Black… 1.5%
• 404518 Oxide Yellow… 1%
• 404402 Indian Red… 0.1%
• 404518 Shanin(?) Blue… 0.1%