Hay Joe. Thanks for the pep talk on being lazy. I am not sure where to do my research. So I felt that reaching out to you more advanced sailor would do no harm obvious you find them irritating. Please forgive me!!!
Sorry my friend, if that seemed harsh. I certainly want you to know that isn't the case at all. What I wanted to do is urge you to move to another level and perhaps contribute to the group with this interesting colored sail question. Look, the only verified "experts" on the forum are Peggy (a published authority on MSD's) Don (ditto on basic sail trim) and MaineSail (who has been ill and limits his participation) all the rest of us are self appointed raconteurs with varied experiences who simply like learning from each other.
So let me help you get started: get a copy of "The Annapolis Book of Seamanship" by John Rousmaniere, also "The Art and Science of Sails" by Tom Whidden....subscribe to Sail Magazine.... and most importantly..... learn to search GOOGLE. Read the books, follow what's going on in the sailing world with that and other magazines or explore sailing YouTube channels,... and learn all the parts of a boat so your google searches can be precise. You'll also find that every sailmaker has a website, so does every hardware maker, so does every rope maker, If you google the various companies that make products for sailors you'll find they all have instructional articles and vids. Some online chandleries are: West Marine, Defender, Hamilton Marine, Mauri Pro Sailing, Velas Sailing, etc (google for more) Some hardware companies are, Ronstan, Harkin, Garhaurer Marine, Scheaffer, Lewmar, Antal, etc (google, remember) Some sailmakers are: North Sails, The Sail Warehouse, Quantum, UK, Doyle, Precision, (geez there's so many) Some quality rope makers.... New England Ropes, Samson Ropes, Marlow, Yale Cordage, Robline.... (again, google)
YouTube has lots of good stuff, lots of crap too, but skim through that on a daily basis for anything that peaks your interest. There are many instructional vids on YouTube.... watch them... and just because they are 20 - 30 years old doesn't mean they aren't relevent... most of us have boats that old or older. (mine's 46).....
Okay, my brother,.... that should get you started. You know what they say: Give a man a fish... or teach him how.... much more powerful. Now.......... please find the answer to whether colored sails are not as strong as white sails and get back to us.