Raisins are alkaline.

The sodium, potassium, magnesium and calcium ions produced by the metabolism of raisins tend to produce some amount of alkali in the body, creating an alkaline reaction. Generally speaking, foods containing potassium, calcium, magnesium and other minerals are alkaline foods.

Acidic and alkaline foods are not measured directly on pH paper (or similar methods), but rather on the acidity or alkalinity of the final product of the food after it enters the body and is metabolized.

Expanded information:

1, acidic foods "are: protein food groups, such as livestock, poultry, eggs, fish, shellfish, cheese, peanut butter, peanuts; high-fat food groups, such as bacon, walnuts, sesame seeds, salad dressings; high-carbohydrate food groups, including corn bran, oats, macaroni, rice bran, rye, and wheat; and jelly-based desserts and puddings.?

2, common "alkaline food" are: vegetables, all types, especially beets, kale, leeks, mustard greens, turnips, spinach; fruits, all types, especially dates, figs, bananas, dried apricots, apples, prunes, raisins; seasoning / herb, all types, especially mint, basil, cilantro, curry powder, raisins, and so on. Spices/herbs, all types, especially mint, basil, cilantro, curry powder, parsley. Common "neutral foods" are: cream, margarine, oils, corn, honey, tea.

Baidu Encyclopedia - Raisins

People's Daily Online - Foods Are Acidic and Alkaline Fish, meat and eggs are acidic, while fruits and vegetables are alkaline