Yellow, white, pink or blue letter is not nearly as important as getter a reader to call you.

Heck Dev, we even have Pink and white "Yellow Letters".

I think more importantly is if an investor doesn't understand communication then no matter how many calls they get they won't be able t harvest.  

You can do 100 different things, from handwriting envelopes, fake express mailers and everything else that costs money but volume is king.I send out the same letter, on a self mailer, yellow, pink or white - doesn't make a difference, I will get the same reply rate all the time. 1.5% should be a lock, 2-5% will come with better data.For example if you pull credit data, showing 12 90 day late's, you can catch them before they go to a short sale, or the bank work's out a deal.

Colors would be pink for one and yellow for the other. 

Warning, I dont care if you're white, pink, blue, green, or any other color in the rainbow.... 

I know when I print I can, based upon sex,  pink or blue colors,  based upon sir name print language of choice.

Use yellow or Pink.

Good to meet you.Color of the postcard does matter.On small cards the two colors are pink (2 times a year, Mothers Day and Breast Cancer Awareness Month) and yellow. 

I like sending the following Six PiecesOn the postcard send one pink and one yellow.