Wiki

• Color constancy
• Chromatic adaptation
• White point
• CIE 1931 color spaces 
• Spectral power distribution

Konica Minolta

• Precise Color Communication - Part I — Let's study color 
• Precise Color Communication - Part II — Let's Study color in a little more detail
• Precise Color Communication - Part III — Color and Gloss
• Precise Color Communication - Part IV - Color Terms
• Precise Color Communication - Part V - NewColor difference Formula (CIE 2000)
  
  
• Language of Light
• Lighting Technologies, Principles, and Measurement

The Datacolor Learning Center

• Color Science Essentials
  
  • What You Need to Know About Light Sources and Color Evaluation
  • 14 Best Practices for Measuring Color Samples
  • Can You Have Consistent Results Across Different Color Spaces?
  • 8 Factors That Influence the Way You See Colors
  • Color Fundamentals: Eight Things You Need to Know if You Work with Color

X-Rite

• X-Rite Color Detective: The Red Ball Mystery
• Do You Know How Optical Brighteners Work?
• 5 Color Evaluation Pitfalls to Avoid (Light Boots)
• The Science of Visual Evaluation
• 10 Tips for Visually Evaluating Color
  
• What is a Spectrophotometer?
• Color Measurement Devices
• The X-Rite Color Challenge and Hue Test
• SPIN or SPEX: Which is Best for Gloss Measurement?
• Tips and Tools for Liquid Color Measurement
• Flexo Printing Tips and Tricks
• ISO Standards for Flexographic Printing
• Dealing with Color Drift? It Could Be Your Spectrophotometer.
• Effective ways to measure reflective surfaces

Color Perception X-Rite Blog

• Part 1: The Effect of Light
• Part 2: The Impact in Manufacturing
• Part 3: The Tricks the Environment Plays on our Eyes
• Part 4: Human Traits

Why your Color Might be Wrong on Press

• Ink and Standards
  
• Environment
• Instrumentation

HunterLab

• Gloss Measurement: SPIN vs. SPEX
• Spectrophotometer vs. Colorimeter: What’s the Difference?
• Understanding Tristimulus Values & the CIE Color System
• Spectrophotometer Best Practices

PaperOnWeb

You may find PaperOnWeb an interesting Pulp & Paper Resource and Information Site. 

More than 5,000 sites of Paper Manufacturers, Pulp Manufacturers, Paper Chemicals, Machinery and Control System Manufacturers, Paper Converting, Consulting, Testing, Repair, Recruitment, Trading, Distribution, Education, Waste Management Service Providers are listed. 

The site also carries the largest list of Abbreviations & Acronyms, the best and largest Paper Dictionary, a list of Pulp, Paper & Waste Paper Grades,  ISO Sizes, Chemicals used in Pulp and Paper Manufacturing, common Basis Weight, Density of Paper, and Bleaching Stages.

The site also answers some of your simple questions on wood fiber, pulp, and paper. The main chapters are as follows:

• WOOD PROPERTIES
• GRADES OF PAPER
• GRADES OF PULP
• GRADES OF WASTE PAPER 
• BASIS WEIGHT
• PAPER DENSITY
• CHEMICAL
• BLEACHING SEQUENCES 
• PAPER ISO SIZES
• RAW MATERIALS
• PULP PROPERTIES
• PAPER PROPERTIES 
• LENGTH OF PAPER IN ROLL
• PAPER DEFECTS
• PAPER THICKNESS/ CALIPER
• PAPER CALCULATORS

Articles

• An Analysis of the Factors Influencing Paper Selection for Books of Reproduced Fine Art
• An Analysis of the factors influencing paper selection for books of reproduced fine art printed on digital presses