I like to eat them, as they sort of pop in your mouth.  My secretary loves them and will eat all I have to offer.

Just tonight at our supermarket's organic produce department, I seen the absolute worst looking lemons for sale that I have ever seen in by entire citrus life.

I have grown them in the past.  The tree can bloom in one year from seed.  I know of no use for the fruit, however, it can be an ornamental specimen.   Its been a while since I dealt with that variety, but I seem to recall that people dry the fruit and use them in making the beads for a rosary.

What might be an interesting experiment.  Grow the Vaniglia Sanguingo in a cool/cold night temperature.  Cold night temperatures raises the acid levels in citrus.  Citrus can taste different depending on the climate the fruit is grown in.

This is a new video from Dan Willey the Fruitmentor.  It took Dan one year to complete this video.

https://youtu.be/NmBxeMx-yWU

A citrus leaf has a life span of 18 to 24 months then is discarded.  Like humans, we look quite shinny at 18, but at 80 the shine has diminished.

The fight goes on.  some of the claimants have by now probably past away, and more will be gone before this ever gets completely settled.

If your soil is low in nitrogen, then add nitrogen.  Why would you think iron has anything to do with low soil nitrogen?  Blood meal does contain nitrogen, but a conventional nitrogen source such as urea, ammonium nitrate etc. would do a better job

Sunny, the article says "....a soil above 7.0, which can cause nutritional deficiencies"  That all depends on how high the pH is above a pH of 7 the tree is growing in.  Also problems can occur when pH levels goes to far below 6.5.  But back to my statement.  A pH of 6.5 is really not an acid soil, it is almost neutral.

Luak, I have been keeping my greenhouse night temperatures at 55F.  The greenhouse's current thermometer  has 55-f as its lowest setting.  As soon as I can get a new thermometer I will be changing my night temperatures to 40F.  This should help both with the Valentine pummelo, and also enhance the spring floral bloom.

Brix 8:  In GENERAL, the higher the brix count, the better the fruit quality, the healthier the tree, and the fewer pests will attack your tree

I can tell you this from experience.  I grew a Moro Blood orange tree inside my greenhouse. Moro blood oranges turn red with the onset of low night temperatures because they contain the chemical anthocyanin. My tree was planted in the ground, and the greenhouse maintained a night temperature of 55-F.   Under these conditions the tree's fruit did not turn red.  In fact there was never any redness at all in the fruit.  For the best coloration maintain good day time temperatures, and lower temperatures through the night.  A secondary advantage of lower temperatures, would be a better floral bloom in the spring.

sunny, Valentine Pummelo is not a real pummelo.  It is a hybrid of pummelo, mandarin, and blood orange.  The red colorization of the Valentine is due to the blood orange, and blood oranges require cold temperatures to obtain the red color.